Topic 11 Polynomials
A polynomial is an algebraic expression that only contains positive integer powers of a variable. The variable is usually x but it may be other letters such as y or z.
For example each of the following algebraic expressions is a polynomial.
(a) 5x 3 – 4x 2 + 7 (b) 4x 45 – 6x 3 + x (c) 49 – x 2 + x 3
(d) y
3
– y
2
+ 1 (e) 2x
4
– 4z
5
(f) 8k – 5k
2
It is usual to rearrange a polynomial into what is called its Standard Form , this is where you write down the given polynomial in order of its powers with its highest power of x first and then continuing downwards from there.
So for example it would be better to write 49 + x
3
– x
2
in its standard form x
3
– x
2
+ 49.
We call the numbers next to each power its coefficient so in the polynomial 5x 3 – 4x 2 + 7 we would say 5 is the coefficient of x
3
and – 4 is the coefficient of x
2
while the number + 7 is called the constant term .
The degree of a polynomial is the highest power of x it contains so in the above examples.
The degree of the polynomial 5x
3
– 4x
2
+ 7 is 3.
The degree of the polynomial 4x
45
– 6x
3
+ x is 45.
The degree of the polynomial 49 – x 2 + x 3 is 3.
Certain polynomials are given special names depending on the degree of the polynomial.
If the degree is 1, for example 3x – 7 we say that the expression is Linear.
If the degree is 2, for example 5x
2
+ x – 4 we say that the expression is a Quadratic.
If the degree is 3, for example x
3
+7x
2
+ 2 we say that the expression is a Cubic.
If the degree is greater than 3 we call it a polynomial of degree n.
Page | 1

Topic 11 Polynomials
Example 1: Express each polynomial in descending order. Give the degree of each polynomial:
(a) 6x – 5 – 2x 3 (b) 8 – y 3 (c) 6x 2 – 7x – x 4 + 4
(d) 10y + y
5
(e) x
2
– 3x
6
+ 2x (f) 5t – 10t
2 – 6
Solution (a): 6x – 5 – 2x
3
=
– 2x 3
+ 6x – 5 Degree = 3
Solution (b): 8 – y
3
=
– y 3
+ 8 Degree = 3
Solution (c): 6x
2
– 7x – x
4
+ 4 =
– x 4
+ 6x
2
– 7x + 4 Degree = 4
Solution (d): 10y + y
5
= y
5
+ 10y Degree = 5
Solution (e): x
2
– 3x
6
+ 2x =
– 3x 6
+ x
2
+ 2x Degree = 6
Solution (f): 5t – 10t
2 – 6
=
– 10t 2
+ 5t – 6 Degree = 2
Exercise 1:
1. Which of the following algebraic expressions are polynomials.
(a) 2x
5
– x
2
+ 3x (b) 4x
4.5
– 6x
3
+ x (c) 49 – √𝑥
(d) 2y
5
– 3y
6
+ 9 (e) 𝑥 2 −8 𝑥 3
(f) 7t– t
2
2.
Express each polynomial in descending order (its Standard Form).
Give the degree of each polynomial:
(a) 4x – 4x
4
(b) 7y – y
2
(c) 2x
3
– x + 3x
2
+ 4
(d) b + b 6 (e) 7c 2 – 49c 5 + 6 (f) 4d – d 2 – 1
Page | 2

Topic 11 Polynomials
The process o adding or subtracting polynomials involves collecting like terms together and then adding and subtracting them. What we mean when we say “like terms” is that we have terms which contain the same powers of same variables. They may have different coefficients, but that is the only difference.
You probably know that if you have an expression like 4 + 3x you cannot add those terms to simplify it in any way. That’s because one term in a constant (the 4) and the other term has a variable (the x ). We say that these are not like terms and cannot be combined. On the other hand it is possible to simplify the expression 4x + 5x to get 9x as we do have like terms and can therefore combine them in the usual way.
It is also not possible to add 4x
3
+ 3x
2
as x
3 and x
2
are completely different powers of x and are not considered like terms on the other hand you can add 5x
4
+ 3x
4
– 2x
4
= 6x
3
as these are all the same powers of x and are considered like terms.
In order to add or subtract a polynomial you typically group like terms together and add or subtract each group of like terms together.
Example 1: Simplify the algebraic expression 2x
4
+ 3x
2
– 2x + 3x
4
+ 6x
2
+ 8x + 8
Solution: This expression can be simplified by identifying like terms and then grouping and combining like terms, so we have three groups of like terms
+ 2x
4
and + 3x
4
are like terms, and can be combined to give + 5x
4
+ 3x
2
and + 6x
2
are like terms, and can be combined to give + 9x
2
– 2x and + 8x are like terms, and can be combined to give + 6x the constant + 8 is on its own so it will stay as + 8
So after simplifying, this expression becomes:
2x
4
+ 3x
2
– 2x + 3x
4
+ 6x
2
+ 8x + 8 = 2x
4
+ 3x
4
+ 3x
2
+ 6x
2
– 2x + 8x + 8
= 5x
4
+ 9x
2
+ 6x + 8
Example 2: Simplify the polynomial (6x 3 – 5x) + (3x 3 – 4x 2 )
Solution: (6x
3
– 5x) + (3x
3
– 4x
2
) = 6x
3
+ 3x
3 – 4x 2 – 5x
Rearrange like terms in order
= 9x
3 – 4x 2 – 5x
Add and subtract like terms
Page | 3

Topic 11 Polynomials
Example 3: Simplify the polynomial 5x
3
– 5x
4
+ 2x
3
– x
4
Solution: 5x
3
– 5x
4
+ 2x
3
– x
4
=
– 5x 4
– x
4
+ 5x
3
+ 2x
3
Rearrange like terms in order
=
– 6x 4
+ 7x
3
Add and subtract like terms
Example 4: Add the polynomials ( 2y
3
+ 8y ) and ( y
3
– 9y)
Solution: ( 2y
3
+ 8y ) + ( y
3
– 9y) = 2y
3
+ 8y + y
3
– 9y
= 2y
3
+ y
3
+ 8y – 9y Rearrange like terms in order
= 3y
3
– y Add and subtract like terms
When you subtract polynomials we need to be careful to subtract all the terms and not just the first term. For example (6x
3
– 3x + 1) – (x
3
+ 5x – 2) = 6x
3
– 3x + 1 – x
3
– 5x + 2
This is because we are subtracting all the terms in this bracket so – (x
3
+ 5x – 2) is the same as
– (x 3
+ 5x – 2) =
– 1(x 3
+ 5x – 2) =
– x 3
– 5x + 2.
As long as we pay attention to this fact subtraction of polynomials is a relatively straight forward process.
Example 4: Simplify ( 2y
3
+ 8y ) – ( y
3
– 9y)
Solution: ( 2y 3 + 8y ) – ( y 3 – 9y) = 2y 3 + 8y – y 3 + 9y
= 2y 3 – y 3 + 8y + 9y Rearrange like terms in order
= y
3
+ 17y Add and subtract like terms
Example 5: Subtract ( 2y
3
+ 8y ) from ( y
3
– 9y)
Solution: ( y
3
– 9y) – ( 2y
3
+ 8y ) = y
3
– 9y – 2y
3
– 8y
= y
3
– 2y
3
– 9y – 8y Rearrange like terms in order
=
– y 3
– 17y Add and subtract like terms
Notice the order that we subtracted the two polynomials subtract ( 2y
3
+ 8y ) from ( y
3
– 9y)
We have the polynomial ( 2y
3
+ 8y ) first and subtract the polynomial ( y
3
– 9y) from it.
Page | 4

Topic 11 Polynomials
Exercise 2:
1. Add the polynomials (5x
3
– 4x) + (6x
3
+ 3x
2
)
2. Simplify the following.
(a) (6x
2
– 5x + 3) – (x
2
+ 8x – 1) (b) 8x
3
– 2x + x
3 – 2x
(c) (5x
4
+ 2x
2
) + (–3x
2
+ x
3
) (d) (x
3
– 4x) – (–2x
3
+ 3x)
(e) (5x 2 – 3x – 1) – (x 2 – 4x + 1) (f) (6x 3 – 5x) + (3x 3 – 4x 2 )
(g) (6x
2
– 5x + 3) – (x
2
+ 8x – 1) (h) (4 w
2
– 4 w – 8) – (2 w
2
+ 3 w – 6)
(i) (9x
2
+ 7x – 5) – (3x
2
+ 3.5) (j) 8x
3
– 2x + x
3 – 2x
(k) (5x
4
+ 2x
2
) + (–3x
2
+ x
3
) (l) (x
3
– 4x) – (–2x
3
+ 3x)
(m) (5x
2
– 3x – 1) – (x
2
– 4x + 1) (m) (6x
3
– 5x) + (3x
3
– 4x
2
)
(n) (6x
2
– 5x + 3) – (x
2
+ 8x – 1) (o) (5x
2
– x – 1) – (–3x
2
– 2x – 5)
(p) (– 5x
2
– 2x ) – (2x
2
– 7x + 9) (q) (8x
3
– 2x
2
– 4x + 5) – (5x
2
+ 8)
(r) (2x
3
– 4x
2
+ 5x – 7) – (3x +
3
5 x
2
– 5) (s) (5x
3
+ 2x
2
– x + 1) + (2x
3
– 6x
2
– x )
(t) (d 4 – 3d + 8) – (2d 4 – 3d + 4) (u) 12p 2 – 5p + p 2 +3p – 7p 2 – 2
3 Subtract (5x + 4) from (8x + 2)
4. Add: (5x 3 – 4x) + (6x 3 + 3x 2 )
5. Subtract: (5x
2
– 2x + 3) from (x
2
+ 4x – 1)
6. Subtract (5x – 6) from (2x 2 – 4x + 8)
7. Subtract: (x
2
+ 4x – 1) from (5x
2
– 2x + 3)
8. Subtract (2x 2 – 4x + 8) from (5x – 6)
Page | 5

Topic 11 Polynomials
The distributive law states that for all variables a,b and c a(b + c) = ab + ac
The distributive law allows us a means of multiplying out parenthesis and to simplify the results.
Example 1: Use the distributive law to remove the parenthesis form the expression 5(x + 3).
Solution: 5(x + 3) = 5(x) + 5(3) Use the distributive Law
= 15x + 15
Example 2: Use the distributive law to remove the parenthesis form the expression – 5(4x
2
– 3).
Solution:
– 5(4x 2
– 3) = (– 5)(4x
2
) + (– 5)(– 3) Use the distributive Law
=
– 20x 2
+ 15
Example 3: Use the distributive law to remove the parenthesis form the expression
– 2(4x 2
+ 3x – 7).
Solution:
– 2(4x 2
+ 3x – 7) = (– 2)(4x
2
) + (– 2)(+ 3x) + (– 2)( –7) Use the distributive Law
=
– 8x 2 – 6x + 14
Example 4: Use the distributive law to remove the parenthesis form the expression 5x(2x
2
+ 4).
Solution: 5x(2x
2
+ 4) = 5(2x
2
) + 5(4) Use the distributive Law
= 30x
2
+ 20
Example 5: Use the distributive law to remove the parenthesis form the expression
– x 2 (2x 3 + x – 3).
Solution:
– x 2
(2x
3
+ x – 3) = (– x
2
)(2x
3
) + (– x
2
)(x) + (– x
2
)(– 3) Use the distributive Law
=
– 2x 5
– x
3
+ 3x
2
Page | 6

Topic 11 Polynomials
When you simplify a polynomial expression you may also have to use the distributive law to rearrange the expression first and then you can simplify the expression. In some cases, you may have to perform other simplification before you can combine like terms.
Example 6: Simplify 4(2x – 3) – 4(x + 5)
Solution: 4(2x – 3) – 4(x + 5) = (4)(2x) +(4)(– 3) – 4(x) + (– 4)(5) Use the distributive Law
= 8x – 12 – 4x – 20
= 8x – 4x – 12 – 20 Rearrange like terms
= 4x – 32
Example 7: Simplify the algebraic expression 3b
3
– 2(4b
3
– 6b + 2) + 7
Solution: The brackets in this expression can be removed first, and then the expression may be simplified.
3b
3
– 2(4b
3
– 6b + 2) + 7 = 3b
3
– 8b
3
+ 12b
2
– 4 + 7 Use the distributive Law
= – 5b 3 + 12b 2 + 3
Example 8: Simplify 2x
3
(2x – 5) – 3x(x
2
+ 5)
Solution: 2x
3
(2x – 5) – 3x(x
2
+5x
3
) = 2x
4
– 10x
3
–3x
3
– 15x
4
Use the distributive Law
= 2x 4 – 15x 4 – 10x 3 – 3x 3 Rearrange like terms
= – 13x
4
– 13x
3
Example 9: Simplify 7x(2 – 5x) – 3x 3 + 5x
Solution: 7x(2 – 5x) – 3x
3
– 14x = 14x – 35x
2
–3x
3
– 14x Use the distributive Law
= – 3x
3
– 35x
2
+ 14x – 14x Rearrange like terms
= – 3x
3
– 35x
2
Page | 7

Topic 11 Polynomials
Exercise 3:
1. Express each of the following as polynomials in their standard form.
(a) 3(x + 8) (b) 2(4y
2
+ 9y) (c) 2(3a
3
+ 4a
2
+ 9)
(d) 4x
3
(x – 6) (e) a( 4 + 5a) (f) –5c( 1 – 4c)
(g) –2d 3 (d – 7d 2 ) (h) 2(x 2 + 7) (i) x( 5x + 2x 6 )
(j) 2x
2
(4x – 3) (k) –6x(2 – x
3
) (l) 4x
5
(2x
2
– x + 5)
(m) –2x
2
(3x
2
– 4x + 2) (n) –x
2
(4x
2
– 2x + 1) (o) 5x
3
(3x
2
– x + 2)
(p) 4x
5
(2x
2
– x + 5) (q) 0.3x(2xy + 5x – 6y) (r)
1
3 y ( y
2 
6 y
2. Express each of the following as polynomials in their standard form.

3 x )
(a) 4(x
3
– 6x) + 34x(x
2
– 8)
(b) 5(3y
2
+ 4y) – 2(10y + 9)
(c) 2t(3t + 6) – 12(t 2 + 3t + 8)
(d) 5t
3
(t – 3t
2
) + 5t
2
(t
2
– t
3
)
Page | 8

Topic 11 Polynomials
In order to expand the multiplication of two parentheses we use the algebraic technique of FOIL.
This Mnemonic stands for First Outer Inner Last and gives us the systematic order in which you perform the multiplication. The general multiplication is shown below.
Outer
First
(a + b)(c + d) = ac + ad + bc + db
Inner
Last
F First: This is the product of the first term in each parenthesis.
O Outer: This is the product of the first term in the first parenthesis and the second term
in the second parenthesis.
I Inner: This is the product of the second term in the first parenthesis and the first term in the second parenthesis.
L Last: This is the product of the second term in the each parenthesis.
Example 1: Expand each of the following
(a) (x + 2)(x + 3) (b) (a – 2)
2
(c) (2r + 3)(r – 7)
(d) (2x + 2)(3x – 3) (e) (4b – 3) 2 (f) (5d – 2)(3d – 4)
(g) (0.5x + 1.4)(3.5x – 1) (h) (
1
2 y – 1)
2
(i) (
1
2 d – 3)(
1
2 d – 5)
Solution (a): (x + 2)(x + 3) = x
2
+ 3x + 2x + 6 = x
2
+ 5x + 6
F O I L
Solution (b): (a – 2) 2 = (a – 2)(a – 2) = a 2 – 2a – 2a + 4 = a 2 – 4a + 4
F O I L
Solution (c): (2r + 3)(r – 7) = 2r 2 – 14r + 3r – 21 = 2r 2 – 11r – 21
F O I L
Solution (d): (2x + 2)(3x – 3) = 6x
2
– 6x + 6x – 6 = 6x
2
– 6
F O I L
Page | 9

Topic 11 Polynomials
Solution (e): (4b – 3)
2
= (4b – 3)(4b – 3)
= 16b
2
– 12b – 12b + 9 = 16b
2
– 24b + 9
F O I L
Solution (f): (5d – 2)(3d – 4) = 15d
2
– 20d – 6d + 8 = 15d
2
– 26d + 8
F O I L
Solution (g): (0.5x + 1.4)(3.5x – 1) = 1.75x
2
– 0.5x + 4.9x – 1.4 = 1.75x
2
+ 4.4x – 1.4
F O I L
Solution (h): (
1
2 y – 1)
2
= (
1
2
=
4
1 y – 1) ( y
2
–
1
2
1
2 y – 1) y –
1
2 y + 1 =
F O I L
1
4 y
2
– y + 1
Solution (i): (
1
2 d – 3)(
1
2 d – 5) =
1
4 d
2
–
5
2 d –
3
2 d + 15
F O I L
=
1
4 d
2
– 4 d + 15
Example 2: Expand each of the following
(a) (x + 3y)(x + 4y) (b) (3x – b)(x + 4b) (c) (5y – 6x)
2
(d) (4x – y)
2
(e) (x
2
– 3)(x – 3x
2
) (f) (5xy + 4x)(5yx – 4x)
Solution (a): (x + 3y)(x + 4y) = x
2
+ 4xy + 3xy + 12y
2
= x
2
+ 7xy + 12y
2
F O I L
Solution (b): (3x – b)(x + 4b) = 3x
2
+ 12bx – bx – 4b
2
= 3x
2
+ 1bx – 4b
2
F O I L
Solution (c): (5y – 6x)
2
= (5y – 6x) (5y – 6x)
= 25y
2
– 30xy – 30xy + 36x
2
= 25y
2
– 30xy + 36x
2
F O I L
Solution (d): (4x – y) 2 = (4x – y)(4x – y)
= 16x
2
– 4xy – 4xy + y
2
= 16x
2
– 8xy + y
2
F O I L
Solution (e): (x 2 – 3)(x – 3x 2 ) = x 3 – 3x 4 – 3x + 9x 2
F O I L
Solution (f): (5xy + 4x)(5yx – 4x) = 25x
2 y
2
– 20x
2 y + 20x
2 y – 16x
2
= 25x
2 y
2
– 16x
2
F O I L
Page | 10

Topic 11 Polynomials
Exercise 4:
1. Multiply out and simplify the following.
(a) (x + 3)(x + 4) (b) (3x – 1)(x + 4) (c) (5 – 3x)(6 + 2x)
(d) (3x + 4)(3x – 2) (e) (3x – 6)(4x – 2) (f) (3x – 8)(2x + 3)
(g) (4x – 4)(7 – x) (h) (5 – 6x)(2x – 7) (i) (2x – 3)(3x + 2)
(j) (2x – 0.1)(x + 2.4) (k) (x + 5)(x – 5) (l) (x – 3)(x – 3)
(m) (5x + 4)(5x – 4) (n) (4x + 3)(3x – 5) (o) (3 – 2y)(2 + y)
(p) (3p + 6)(p – 1) (q) (2z + 3)(z + 2) (r) (5r – 7)(5r +7)
(s) (3x – 2)(2x – 1) (t) (4x + 3)(3x – 5) (u) (2a – 3)(5a + 1)
(v) (5x + 2)(2x – 5) (w) (3 x

3)( x

5) (x) ( a + 1)(2 a + 4)
2. Which of the following is (2 n + 2)(2 n – 2) equivalent to
A. 4n
2
– 4 B. 4n
2
+ 2n – 4 C. 4n
2
– 4n – 4 D. 4n
2
+ 4n – 4
3. Multiply out and simplify the following squares.
(a) (x + 3) 2 (b) (x – 1) 2 (c) (5 – 3x) 2 (d) (3x + 4) 2
(e) (x – 6)
2
(f) (3x – 8)
2
(g) (4x – 5)
2
(h) (5 – 6x)
2
(j) (2x – 0.1)
2
(k) (x + 5)
2
(l) (3 – x)
2
(m) (3 – 2x)
2
4. Multiply out and simplify the following.
(a) (x + 3y)(x + 4y) (b) (3x – b)(x + 4b) (c) (5c – 3x)(6c + 2x)
(d) (3x + 4y)(3x – 2y) (e) (3x – 6b)(4x – 2b) (f) (3x – 8y)(2x + 3y)
(g) (4x – y)
2
(h) (5y – 6x)
2
(i) (2x – 3y)
2
(j) (2x – 0.1y)
2
(k) (x + 5y)
2
(l) (x
2
– 3)(x – 3x
2
)
(m) (5xy + 4x)(5yx – 4y) (n) (4x + 3)(3x – 5) (0) (2y
2 z + 3)(4y
2 z + 2)
Page | 11

Topic 11 Polynomials
In order to divide a polynomial by a constant we separate it into its component parts and divide each separately with the constant.
Example 1: Simplify the following
(a)
12𝑥
3
−42𝑥+24
(b) (–32x – 8)

4 (c)
8𝑥
3
2
−20𝑥+5
−4
Solution(a):
12𝑥
3
−42𝑥+24
=
3
12𝑥
3
Solution(b): (–32x – 8)

4 =
3
−
42𝑥
3
−32𝑥
4
−
+
24
3
= 4x
8
4
= – 8x – 2
3
– 14x + 8
Solution(c):
8𝑥
2
−20𝑥+5
=
−4
8𝑥
2
−4
−
20𝑥
−4
+
5
−4
=
– 2x 2
+ 5x −
5
4
Example 2: Simplify the following
(a)
12𝑥
4
− 8𝑥
2
2𝑥 2
+24
(b) (–32x
2
– 2)

4x (c)
8𝑥
3
−20𝑥+5
−𝑥 3
Solution(a):
12𝑥
4
− 8𝑥
2
+24
=
2𝑥 2
12𝑥
4
2𝑥 2
−
8𝑥
2
2𝑥 2
+
24
2𝑥 2
= 6x
2
– 4 +
12 𝑥 2
Solution(b): (–32x 2 – 2)

4x =
−32𝑥
2
−
4𝑥
2
4𝑥
= – 8x −
1
2𝑥
Solution(c):
8𝑥
3
−2𝑥+7
=
−𝑥 3
8𝑥
3
−𝑥 3
2𝑥
−
−𝑥 3
+
7
−𝑥 3
= – 8 +
2
−𝑥 2
−
7 𝑥 3
Exercise 5: Simplify the following.
(a)
12 x
2 
6 x

3
(b)
2
2 x

4
(c) (–3x – 8)

4
2
(d)
(g)

6 x

4
(e)
2
5 x


5
4
(f)
6 x

12 x
2

3
8 x

12
(h)
4
6 x
4 
10 x
3 
8 x
2
2 x
2
(j)
6 x
2 
3
3 x
2 x

1
(k)
8 x

12
(l)
4 x
2
4 x
4  x
3
2 x 3

5 x
2
(m)
6 x
6 
3 x

1 x
4
Page | 12

Topic 11 Polynomials
Exercise 1:
1.(a) Yes (b) No (c) No (d) Yes (e) No (f) Yes
2.(a)
– 4x 4
+ 4x Degree = 4 (b) – y
2
+ 7y Degree = 2 (c) 2x
3
+ 3x
2
– x + 4 Degree = 3
2.(d) b
6
+ 6 Degree = 6 (e)
– 49c 5
+ 7c
2
+ 6 Degree = 5 (f) – d
2
+ 4d– 1 Degree = 2
Exercise 2:
1. 11x 3 + 3x 2 – 4x
2.(a) 11x
2
– 13x + 4 (b) 9x
3
– 4x (c) 5x
4
+ x
3 – x 2
(d) 3x
3
– 7x
2.(e) 4x
2
+ x – 2 (f) 9x
3
– 4x
2 – 5x
(g) 5x
2
– 13x + 4 (h) 2 w
2
– 7 w – 2
2.(i) 6x
2
+ 7x – 8.5
2.(m) 4x
2
(j) 9x
+ x – 2 (n) 9x
3
– 4x (k) 5x
3
– 4x
2
4
+ x
3 – x 2
(l) 5x
3
– 7x
– 5x (o) 5x 2
– 13x + 2 (p) 8x
2
+ x + 4
2.(q) – 7x
2
+ 5x – 9 (r) 8x
3
– 7x
2
– 4x – 3 (s) 2x
3
–
17 x
2
+ 5x – 2
5
2.(t) 7x
3
– 4x
2
– 2x + 2 (u)– d
4
– 3d + 4 (v) 6p
2
– 2p – 2
3. 3x – 2 4. 11x
3
+ 3x
2 – 4x 5. –4x 2
+ 6x – 4 6. 2x
2
– 9x + 14 7. 4x
2
– 6x + 4 8. –2x
2
+
9x – 14
Exercise 3:
1.(a) 3x + 24 (b) 8y
2
+ 18y (c) 6a
3
+ 8a
2
+ 18 (d) 4x
4
– 24 x
3
1.(e) 4a + 5a
2
(f) –5c + 20c
1.(i) 5x
2
+ 2x
7
(j) 8x
3
– x
2
2
(g) – 2d
4
+ 14d
(k) – 12x + 6x
4
2
(h) 2x
2
(l) 4x
5
+ 14
(2x
2
– x + 5)
1.(m) – 6x
4
+ 8x
3
– 4x
2
(n) – 4x
4
+ 2x
3
– x
2
(o) 15x
5 – 5x 4
+ 10x
3
1.(p) 8x
7 – 6x 6
+ 20x
5
(q) 0.6x
2 y + 1.5x
2
– 1.8xy (r)
1 y
3 
6 y
2  xy
3
2.(a) 38x
3
– 296x (b) 15y
2
– 18 (c) – 30t
3
– 12t
2
+ 12t – 96 (d) – 20t
5
+ 10t
4
Exercise 4:
1.(a) x
2
+ 7x + 12 (b) 3x
2
+ 6x – 4 (c) – 6x
2
– 8x + 30 (d) 9x
2
+ 6x – 8
1.(e) 12x
2
– 30x – 8 (f) 6x
2
– 7x – 24 (g) – 4x
2
+ 32x – 28 (h) – 12x
2
+ 52x – 35
1.(i) 6x 2 – 5x – 6 (j) 2x 2 + 4.7x – 0.24 (k) x 2 – 25 (l) x 2 – 6x + 9
1.(m) 25x
2
– 16 (n) 12x
2
– 11x – 15 (o) – 2y
2
– y + 6 (p) 3p
2
+ 3p – 6
1.(q) 2z
2
+ 7z + 6 (r) 25r
2
– 49 (s) 6x
2
– 7x + 2 (t) 12x
2
– 11x – 15
1.(u) 10a
2
– 13a – 3 (v) 10x
2
– 21x – 10 (w) 3x
2
– 18x + 15 (x) 2a
2
+ 6a + 4
2. A
3.(a) x
2
+ 6x + 9 (b) x
2
– 2x + 1 (c) 9x
2
– 30x + 25 (d) 9x
2
+ 24x + 16
3.(e) x
2
– 12x + 36 (f) 9x
2
– 48x + 64 (g) 16x
2
– 40x + 25 (h) 36x
2
– 60x + 25
3.(j) 4x 2 – 0.4x + 0.01 (k) x 2 + 10x + 25 (l) x 2 – 6x + 9 (m) 4x 2 – 12x + 9
4.(a) x
2
+ 7xy + 12y
2
(b) 3x
2
+ 6xb – 4b
2
(c) 30c
2
– 8xc – 6x
2
4.(d) 9x
2
+ 6xy – 8y
2
(e) 12x
2
– 30xb + 12b
2
(f) 6x
2
– 7xy – 24y
2
4.(g) 16x
2
– 8xy + 64y
2
(h) 25y
2
– 60xy + 36x
2
4.(j) 4x
2
– 0.4xy + 0.01y
2
(k) x
(i) 4x
2
– 12xy + 9y
2
+ 10xy + 25y
2
(l) x
3
+ 18x
2
– 3x
2
4.(m) 25x
2 y
2
– 20xy
2
+ 20x
2 y – 4xy (n) 12x
2
– 11x – 15 (o) 8y
4 z
2
+ 16y
2 z + 6
Exercise 5:
(a) 6x
(h) 3x
2
– 3x +
3
2
(b) x + 2 (c) −
2 – 5x + 4 (j) 2 −
3
1
4
+ 𝑥 𝑥 − 2 (d) – 3x + 2 (e) – x +
4
1
3𝑥 2
(k)
2 𝑥
− 𝑥
5
(f) – 2x + 4x
3
2
(l) 2𝑥 −
1
2
+
5
2𝑥
2
(g) 2x – 3
(m) 6𝑥 2 −
3 𝑥 3
+ 𝑥
1
4
Page | 13