1) Describe the correlation.
5) Solve the equations below:
2. Write 14 as a percentage of 20
3. What is 3y x 5y ?
4. Convert 2500g to kg

Lesson 8 Expand and Simplify.
Mathswatch 103
• To simplify expressions by collecting like terms.
• To expand individual single brackets.
• To expand and simplify more than one single bracket.
EXTN: To expand and simplify double brackets.
(Grade C)

Lesson 8 Expand and Simplify.
Mathswatch 103
By expanding brackets we mean multiply each term in the bracket by the term outside. Because it is multiplying, we use the grid method for this.
x - 9
3
3x -27
Final Ans: 3x -27

Lesson 8 Expand and Simplify.
Mathswatch 103 x
Expand the following expression x x² x(x +7)
+ 7
+7x
Final Ans: x² + 7x

Lesson 8 Expand and Simplify.
Mathswatch 103
Now you try these…… (You have 5 mins max and must show your working)
Expand each of the following:
(a) 3( x + 8)
(b) 7( x + 2)
(c) 2(5 x - 2)
(d) 8(2 x - 3)
(e) 7( y + 1)
(f) 9(3 k - 8)
(a) 3 x + 24
(b) 7 x + 14
(c) 10 x - 4
(d) 16 x - 24
(e) 7 y + 7
(f) 27 k - 72

Lesson 8 Expand and Simplify.
Mathswatch 103
What happens when we have two individual brackets with a plus or minus between them like below:
5(x - 4) + 3(x- 3)
Answer: We do two separate 2 x 1 grids then collect up like things.
5 x
5x - 20
5x - 20
Final Ans:
- 4
+ x
3 3x +
8x - 29
3x - 9
- 3
- 9
Watch out for negatives.

Lesson 8 Expand and Simplify.
Mathswatch 103
Now some for you to try: How many can you do in 5 minutes? (with workings!)
Expand and simplify each of the following:
(a) 4( x + 5) + 3( x + 2)
(b) 2(3 x + 1) - ( x + 3)
(c) 3(5 x - 2) + 2( x - 1)
(d) 7( x - 2) - 2( x - 1)
(e) 5(3 x - 1) - 4(2 x - 3) + 3( x + 4)
(f) 9 + 2(5 x - 3) - 7(2 x + 4) + 5 x
(a) 7 x + 26
(b) 5 x - 1
(c) 17 x - 8
(d) 16 - 9 x
(e) 10 x + 19
(f) x - 25

Lesson 8 Expand and Simplify.
Mathswatch 103
What’s the difference?
a)
4(x + 6) + 2(x – 7) b)
(4x+6)(2x-7)
So how do we expand when we have two brackets right next to each other then?......

Lesson 8 Expand and Simplify.
Mathswatch 103 x
Expand and simplify the following expression x x²
+5
+5x
(x + 5)(x - 6)
- 6 - 6x -30
Final Ans: x²- x - 30
Watch out for negatives.

Lesson 8 Expand and Simplify.
Mathswatch 103
2a
Expand and simplify the following expression 4a
8a²
+3
+12a
(2a + 3)(4a + 2)
+2 +4a +6
Final Ans: 8a²+ 16a +6

Lesson 8 Expand and Simplify.
Mathswatch 103
Now some for you to try: How many can you do in 5 minutes? (with workings!)
Expand and simplify each of the following:
Watch out for negatives.
(a) (x + 5)(x + 2)
(b) (x - 1)(x + 3)
(c) (x - 6)(x + 1)
(d) (x - 2)(x - 3)
(e) (3x + 1)(2x + 3)
(f) (5x - 3)(2x + 4)
(a) x² + 5x + 2x + 10
(b) x² -1x +3x -3
(c) x² - 6x +1x -6
(d) x² - 2x – 3x +6
(e) 3x²+2x +9x+3
(f) 10x²-6x+20x-12
(a) x² + 7x +10
(b) x² +2x-3
(c) x² - 5x -6
(d) x² -5x +6
(e) 3x²+11x+3
(f) 10x²+14x-12

Lesson 8 Expand and Simplify.
Mathswatch 103

Lesson 8 Expand and Simplify.
Mathswatch 103
• To simplify expressions by collecting like terms.
• To expand individual single brackets.
• To expand and simplify more than one single bracket.
EXTN: To expand and simplify double brackets.
(Grade C)