Transition Mathematics Project: College Readiness Standards STANDARD 7 The student accurately describes and applies concepts and procedures from algebra. NOTE: This standard assumes the student is already proficient with the relevant concepts and procedures described in Component 1.5 of the Washington State Grade Level Expectations through grades 9/10. Components 7.1 Use properties of equality to solve equations through a series of equivalent equations, appropriate properties to simplify expressions, resulting in an equivalent expression, and factors and terms appropriately to simplify algebraic expressions. 7.2 Combine and simplify algebraic expressions which contain polynomials, rational expressions, radicals, or rational exponents. 7.3 Solve the following types of equations and inequalities numerically, graphically, and algebraically. Interpret solutions algebraically and in the context of the problem. Distinguish between exact and approximate answers. [see GLE 1.5.6, grade 9/10] Evidence of Learning Explain the distinction between factor and term EX: Is the following a true statement? Explain why or why not. Find the sum, difference, or product of two polynomials, then simplify the result. EX: 32x 4 5x 2 form a b by its conjugate will always result in an expression with no radical sign. Give a numerical example where neither a nor b are perfect squares. EX: Solve the following equation in more than one way: 2 EX: Explain why or why not the following represents a true statement: x3 3 x EX: If possible, order the following numbers from smallest to largest. Explain your reasoning. 3 EX: Solve the following equation and explain your solution: Explain why multiplying an expression of the a b a b 2 Solve linear equations in one variable. 200 3 , 3 200 ,3 200 2 200 3 200 21 v 9 31 v EX: Solve the equation 7x = 8x. EX: Solve the equation x2 x 4 and verify your solution. 3 2 Explain the distinction between expression and equation EX: As written, x 1 x is best described as x 2 x 3 a) a rational function b) a sum of rational expressions c) a product of rational expressions d) a rational equation. Explain your choice. EX: Perform the indicated multiplication and express the answer using positive exponents. Assume all variables are real. Assume all expressions are defined. Show your work. 1 5 5 5 1 1 4 3 x 2 4 3 x 2 ;z 2 3z 2 3 EX: Write in the form ax2+bx+c: (x+2)2-4(x3)(2x+1)+8x2+2 Explain the distinction between simplify and solve Know what it means to have a solution to an equation. EX: Simplify: x 2 x 2 Which of the following cannot be solved? Explain your choices. 1. 4 x 7 2. 11c 1 0 2 3. x 1 0 4. 3x 4 x 5. f (x) 2x 13 1x 2 5x 4 Note: The 3/11 workgroup decided the spirit of the two bullets below would be better served if they were rewritten in a positive fashion. My suggestions are in red below them. When working with an expression, student does not attempt to isolate a variable or use techniques that require action on both sides 8a bc 2 3 2 Solve systems of linear equations in two variables. EX: Solve the system of equations: 9x+8y=12 and 5x-3y=11 EX: Determine the value of b so that the following system of equations is dependent: 3x 4 2x 2 4x 7 x 2 7x 4 x 1 EX: Complete the following equation so the solution of the 1 4 2 equation is 4: 8x 7 7x ____ x 1 x 3x 4 a2b 3a b EX: Solve linear inequalities in one variable, including those involving “and” and “or.” EX: 3-4x<2+x 4x 16y 4 2x by 2 EX: Construct a system of two linear equations with a solution of (2, 6) so that one line is horizontal and the other line is vertical. Solve linear inequalities in two variables (graphically only). EX: Solve the system of inequalities by graphing: 5x+4y>10 and 2x-3y<5 3 Factor out the greatest common factor from polynomials of any degree, including and from expressions involving rational exponents. EX: Explain how the two terms in the expression 2x 3 42x 3 can be added by factoring out the greatest common factor. EX: Maggie claimed the following expression was factored. Explain why Maggie is correct or incorrect. x2x 1 52x 1 Solve absolute value equations of the form |ax + b| = c. EX: Solve |3x-8|=9 Solve quadratic equations (including those with irrational or complex number solutions; students are not expected to check complex solutions algebraically). EX: Mark wants to solve the quadratic equation x 5x 2 1. He didn’t want to go to all the bother of an equation. Recognize and use appropriate techniques in simplifying expressions. x 1 2 Factor the expression x x Todd claimed the expression x 3 x3 2 was equivalent to the expression x 3 . Is Todd correct? Explain. 2 25x 1 2 EX: 3 EX: Factor the expression 4ax 3 20ax 2 2ax EX: Give an example of a real number for which 2 EX: When working with an equation, if an action leads toone side of the equation becoming zero, the student writes the zero and retains an equation rather than omitting the zero and equals sign, thereby creating an expression. Recognize and use appropriate techniques in solving equations. EX: Jan solved the following equation in this way: 3x 4 x 3x 4x 3x 3x 4 x 3 Explain how you know whether Jan is right or wrong. If Jan is wrong, solve the equation correctly. Factor quadratic polynomials with integer coefficients into a product of linear terms, if possible. EX: Can the quadratic function graphed below be factored into a product of linear terms? Explain your answer. (insert graph here of ½(x-1)^2 – 1) EX: Factor each of the following into a product of linear terms, if possible: x 2 34 x 35 x 2 7xy 6y 2 x 2 10 x 90 EX: Does the equation x2-2x+6=0 have a real solution? Explain. Solve equations in one variable containing a single radical. EX: x 5 x 1 2x 5 = 8 Solve exponential equations in one variable (numerically and graphically). EX: Below is a graph of the equation y 3x . Use the graph to solve x the equation 3 27 . Simplify quotients of polynomials given in factored form, or in a form which can be factored. EX: Explain why ab 1 for all values of a and b ba except when a = b. EX: Simplify each of the following expressions, if possible: to multiply the binomials on the left side and subtract 1 to get zero on one side (so he could use the zero-factor principle). Since 1 times 1 is 1, he thinks he can set each factor to 1. What mathematical help can you give him? (A complete answer will say whether Mark is right or wrong and show why.) xy x a(2x 1) b a 2 b2 6x 2 2x 20 x 3 2x EX: Solve 3 x 2 = 81 EX: The following table represents ordered pairs on the graph of x 1 f (x) . x -2 -1 0 1 9 2 Y 81 9 1 1/9 1/81 a) Use the table to find f(0). b) Use the table to find x so that f(x) = 9. c) Use the table to make a supported conjecture about the value of f(-3). Solve rational equations in one variable that can be transformed into an equivalent linear or quadratic equation. (limited to monomial or binomial denominators) EX: Solve the following two equations: Add, subtract, multiply, and divide two a rational expressions of the form , bxc 1 3 p 1 p 1 4 1 11 b) k 2 3k 6 9 a) where a, b, and c are real numbers such that bx c 0 . EX: Given the two expressions 15 3 and , 4x 1 4x Solve x2 =x+1 2x 3 Solve 1 3 2 4 x 1 x 1 a) Add the expressions. 15 3 from . 4x 1 4x c) Multiply the expressions. 15 3 d) Find the quotient of and 4x 1 4x b) Subtract EX: The sum of arational expression and 1 is x5 2x . Find this rational expression. x 25 Simplify products and quotients of single-term expressions with rational exponents (rationalizing denominators not necessary). EX: Simplify (a12b14c22)1/2 2 EX: Which of the following are true for all values of x and y, except possibly at 0? x y 2 x2 y2 1 1 1 4 x 3 4x 3 Recognize the equivalence between expressions with rational exponents and a radicals ( x b b x a , a, b integers, b0). Solve literal equations (formulas) for a particular variable. Solve PV=nRT for R Solve A Solve 1 1 hb1 hb2 for h 2 2 xz 5e m for v 2 vm (Needs context, not necessarily a word problem) Transition Mathematics Project: College Readiness Standards STANDARD 8 The student accurately describes and applies function concepts and procedures to understand mathematical relationships. NOTE: This standard assumes the student is already proficient with the relevant concepts and procedures described in Component 1.5 of the Washington State Grade Level Expectations through grades 9/10. Components 8.1 Recognize functional relationships presented in words, tables, graphs, and symbols (for any function). [ see GLE 1.5.3] [Recognize functional relationships.] EX: Do the following tables represent functions? Explain why or why not. X q(x) X f(x) 1 ½ 2 ¼ 1 ½ 2 ¼ 3 1/2 2 1/8 4 1/16 EX: State the type of function given in the sketch: (next page—4 graphs) (There are multiple types of function 8.2 Represent functions (linear, quadratic, exponential, piecewise, and reciprocal) using and translating among words, tables, graphs, and symbols. [see GLEs 1.5.2, 1.5.4] 8.3 Analyze and interpret features of a function 8.4 Model situations and relationships using a variety of functions (linear, quadratic, exponential, piecewise, and reciprocal). [see GLE 1.5.4] Evidence of Learning Evaluate functions to generate a graph. EX: Determine 3 ordered pairs on the graph of 1 the function f (x) 5x , then graph the 2 function. EX: the function Given 3t D(t) when 0 t 1 3 6(t 1) when t > 1 complete the following table and sketch a graph of the function: T 0 D 1 2.25 3 12 5 21.6 Describe patterns in the function's rate of change, identifying intervals of increase, decrease, and constancy. If possible, relate the patterns to the function's description in words or its graphical representation. Identify y-intercepts and zeros using symbols, graphs and tables. f ( x) 2 x 2 9 x 5 EX: For . What is the y-intercept? How do you know? Factor the expression and find the x-intercepts. Plot the points and graph the function. What x-value does the vertex have? How can you find the corresponding y-value? Choose a function suitable for modeling a real-world situation presented using words or data. Determine and interpret the meaning of rates of change, intercepts, zeros, extrema, and trends. Identify and justify whether a result obtained from a function model has real-world significance. here…) [w/linear choice] Determine the domain of a function. EX: Describe the domain of the functions f(x) = f(x) = 2 and 4x 5 4x 5 b) f (x) x 2 2x 8 Understand and interpret function notation, particularly as it relates to graphic displays of data. EX: Understand the difference between f x 2, f 2 x . EX: A function N maps a person to the first letter of their first name. (I.e., Don maps to D). What is the domain and range of N? EX: Describe the domain of the function 2x f (x) 4x 5 (no 2x just 2) EX: EX: The two ordered pairs (-4, 0) and (2, 0) are on the graphs of which of the following functions? a) f (x) x 2 2x 8 Describe the domain of the function f(x) = (2x)/(4x-5); f(x) = 4x-5 c) f (x) x 3 2x 2 8x d) f (x) 4x 2 Graph the functions you’ve selected by finding additional ordered pairs for each. Describe relationships between the algebraic features of a function and the features of its graph and/or its tabular representation. EX: Explain why the domain of the rational 3 2 expression x 1 has no excluded values. Use simple transformations (horizontal and vertical shifts, reflections about axes) to create the graphs of new functions using linear, quadratic and/or absolute value functions. Algebraically construct new functions using addition and subtraction (e.g., profit function). EX:Mike has a job that pays $8.52 per hour. a) Write a function, f, describing his salary per hours worked, x. b) If Mike saves 20% of his total salary, write a function, g, describing the amount Mike saves per hours worked. c) Write a function, h, describing the amount of money Mike has left after saving his 20%. EX: Line a has intercepts (0, 2) and (1, 0), line b has intercepts (0, 4) and (2, 0) and line c has intercepts (0, 6) and (3, 0). Will these lines ever intersect? Explain. EX: What is the y-intercept of the graph of y=3x2 – 5x + 7 ? EX: Find the zeros, y-intercept, and domain of f(x) = (2x-3 ) - 5 EX: What does ‘zero of a function’ mean? EX: x Graph the function 1 f (x) . 2 Find its zeros, y-intercepts, domain, and discuss its end behavior. EX: Identify extrema and trends using graphs and tables. EX: Find the vertex of the function h(x) x 2 8x 3 Additional Examples CRS 7.1 (bullet 1) EX: Which of the following can be simplified by removing the common factor (2x – 3)? Justify your answer: 2x 3 x(2x 3) x(2x 3) 2 x (2x 3) x(2x 3) 2x 3 x(2x 3) x 2 (2x 3) CRS 7.1 (bullet 5) Carlos simplified this expression as follows. Is he right or wrong? Explain why. 2 3 x x 2 3 x x x 2x 3x x x 2 35 CRS 7.2 (bullet 5) Simplify 1/(x-1) – 2/(x-1) Simplify 3/(2x-6) ÷ -5/(-x+3) CRS 7.2 (bullet 6) Simplify (2x3/2y2)(3xy1/3) Simplify (6x-3/4y3)/(12x2y-1/2) CRS 7.2 (bullet 7) EX: Assuming all expressions are defined, which of the following statements are true? Which are false? Explain. 1 1 x 3 y 2 2 x 3 y 2 1 x y 3 2 2 x 3 y 2 EX: If f(x) = x2/3, find f (8) CRS 8.1 (bullet 1) 1. The USGS keeps track of the temperature inside a volcano on the island of Hawaii. Would these data represent a function? 2. Recognize examples of functions of each of the following types. (Assume x is the input variable and y is the output variable.) i) Given by a table: ii) Given by a graph: iii) Given by a formula: Recognize examples of i), ii), and iii) that are NOT functions, and explain why they are not. CRS 8.1 (bullet 2) 3 1. Explain why the domain of the rational expression x 1 has no excluded values. 2 2. A function N maps a person to the first letter of their first name. (I.e., Don maps to D). What is the domain and range of N? CRS 8.2 (bullet 2) 1. The table below is from y h(x ) . What are the zeros of f? What are two factors of f? x y1 -7 -6 -5 -4 -3 0 -2 -2 0 4 2. The x-intercepts of the graph of y g (x) are (-5, 0) and (0,0). What are two factors of g (x ) ? What are the zeros of g (x ) ? 3. Given f (1) 0 , f (4) 0 and f (2) 0 : What are the factors of f? y f (x) ? What are the x-intercepts of the graph EX: The expression b 4ac found in the quadratic formula is so important that it gets its own name – the “discriminant.” “Discriminant” shares the same root as the word “discriminate,” which means “to distinguish from another object.” (cf. Mirriam-Webster Online) What does the discriminant distinguish between, and how do you use it to do so? The values of the discriminant fall into three major categories. For each category, sketch the graph of a quadratic that would have a discriminant like the one you describe. (You do not need to provide any quadratic equations as part of your answer.) 2 EX: y h(x ) . The table below is from What are the zeros of f? What are two factors of f? x y1 -7 -6 0 -2 -5 -4 -3 -2 0 4 EX: The x-intercepts of the graph of EX: y g (x) are (-5, 0) and (0,0). What are two factors of g (x ) ? What are the zeros of g (x ) ? f (1) 0 f (4) 0 and f (2) 0 : Given , What are the factors of f? What are the x-intercepts of the graph y f (x) ? EX: Given the graph of a polynomial h: (may be above level) Find the factors of h. Find the zeros of h. Find the x-intercepts of h. EX: Use the given graph of y f (x) to answer the questions. a. Find the domain of f. b. Find the range of f. c. Solve f ( x ) 0 d. Find the output if the input is 3. e. Find the input if the output is -3. f. Find f (1) g. Find x such that f ( x) 2 CRS 8.2 (bullet 3) 1. If f (2) 3 : Write an ordered pair that must be on the graph of f ( x ) 5 Write an ordered pair that must be on the graph of f ( x) 5 Write an ordered pair that must be on the graph of f ( x 2) Write an ordered pair that must be on the graph of f ( x 3) Write an ordered pair that must be on the graph of f ( x 1) 5 Describe the strategy you used to answer the above items. 2. Use the given table of values for y = f(x) to complete the following table. x 0 1 2 3 4 y 7 1 –4 –4 –7 x 3 y = f(x - 3) 7 1 –4 –4 –7 5 8 8 8