# Additional Practice Lessons 2.02 and 2.03

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1 Additional Practice Lessons 2.02 and There are two numbers n that satisfy the following equations. Find both numbers. a. n(n 1) 306 b. n(n 1) 462 c. (n 1)(n) The following function is defined by a messy rule. p(x) (x 2)(x 2 2x 5) x(x 2 4x 9) a. What is p(0)? b. What is p(5)? c. What is p(10)? d. Expand the expressions in this function to find a simpler rule for p(x). 3. A square is (x 1) inches on each side. You cut a smaller square hole from the larger square that is (y 1) inches on each side. In terms of x and y, find the area of the leftover shape in square inches. Explain your method. 4. Suppose p(x) x 4 3x 2 1 and q(x) (x 2 x 1)(x 2 x 1). Prove that p and q are the same function. 5. Find all of the solutions to each equation. a. (x 8)(x 3) 0 b. (x 11)(x 12) 0 c. 3x(x 6) 0 d. (x 2)(x 3)(x 4) 0 6. What are all the solutions to the equation x 5 x 3? 7. Find all of the solutions to each equation. a. (x 19)(x 27) 0 b. (x 13)(x 47) 0 c. (3x 4)(x 1) 0 d. x(12x 5) 0 8. a. Rewrite (x 5)(x 8) in the form x 2 ( )x ( ). b. Suppose (x p)(x q) x 2 (4 7)x (4 7). Use the pattern in part (a) to find p and q. 9. Find an equation with only the solutions listed. a. 4 and 7 b. 4 and 7 c. 4 and 7 d. 4, 7, and 0 115

2 Additional Practice Lesson Find the greatest common factor of each set of expressions. a. 10x 4 and 18x 2 b. 10x 4 and 40x c. 18p 2 and 27q 2 d. pq and pr e. m 2 n and mn 2 f. a 3 b 3, a 2 b 2, and a 2 c 3 2. Write each expression as a product of two expressions. One expression should be the greatest common factor of the terms. If there is no common factor, then the answer is the original expression. a. 10x 4 18x 2 b. 10x 4 40x c. 18p 2 27q 2 d. pq pr e. m 2 n mn 2 f. a 3 b 3 a 2 b 2 a 2 c 2 3. Find all solutions to each equation. Use factoring and ZPP. a. 10x 3 8x 2 0 b. 5x px c. 10x 3 25x 2 d. x 2 64x e. 10x 3 40x 0 f. 2x 2 2y Write each expression as a product. a. 5x(4x 1) 6(4x 1) b. (2x 3)(3x) (2x 3)(5) 5. Write each expression as a product of expressions. a. 4py 7qy b. 4px 2 7qx 2 c. 4p(x 3) 7q(x 3) d. 4px 2 8qx 2 e. 4px 12p 7qx 21q f. p(r s) (r s) 6. This graph shows two points on the graph of y x 2. y d O a b x Show that the vertical distance d is (b a)(b a). 7. Expand each expression. a. (x 1)(x 5 x 4 x 3 x 2 x 1) b. (x 1)(x 6 x 5 x 4 x 3 x 2 x 1) c. (x 1)(x 7 x 6 x 5 x 4 x 3 x 2 x 1) d. Use the pattern in parts (a) (c) to find the missing expression in the equation (x 1)( ) x 10 2x

3 Additional Practice Lessons 2.06 and a. Find two polynomials with the same degree that have a sum of x 2 5x 3. b. Find two polynomials with different degrees that have a sum of x 2 5x 3. c. Find two polynomials that have a sum of 10. d. Find two polynomials that have a product of x Use h(x) x 2 3x 8. a. Find a polynomial k(x) such that h(x) k(x) 3x 2 5x 10. b. Find a polynomial m(x) such that h(x) m(x) 2x 2 3. c. Find a polynomial n(x) such that h(x) n(x) has degree 2 and h(x)n(x) has degree Find the value of d such that (x d)(x 5) x 2 8x 15 is an identity. 4. Expand and combine like terms. a. (x 1) 2 x 2 b. (x 1) 3 x 3 c. (x 1) 4 x 4 d. (x y) 2 y 2 e. (x y) 3 y 3 f. (x y) 4 y 4 g. x(x 1) x h. x(x 1)(x 2) x(x 1)(3) i. x(x 1)(x 2) x(x 2)(3) 5. Transform the expression below into normal form. For what values of b is the coefficient of x equal to zero? (x 2 2x b)(x 2 2x 5) 6. Prove that each identity is true. Use basic and derived rules. a. x 10 4 (x 5 2)(x 5 2) b. x 3 1 (x 1)(x 2 x 1) c. (a 2b) 2 (a 2b) 2 8ab d. (n 1) 3 n 2 (n 3) 3n 1 e. (x 2 2x)(x 2) (x 2 2x)(x 2) f. (x 2 ax)(x a) (x 2 ax)(x a) 7. Show that each equation is an identity. a. 4a 2 b 2 2a(2a b) b(2a b) b. (2a 1)(2a b) (b 1)(2a b) (2a b)(2a b) 8. Find the normal form of each polynomial. a. (1 x x 2 )(1 x 3 ) b. (1 x x 2 x 3 )(1 x 4 ) 117

4 Additional Practice Lesson Without expanding, find the coefficient of x 3 in the normal form of each polynomial. a. (3x 3 2x 2 5x 1)(x 2 3) b. (x 1) 5 c. (x 1)(x 6 x 5 x 4 x 3 x 2 x 1) 2. What is the coefficient of xy 4 in (x y) 5? 3. What is the coefficient of x 4 y 2 in (x y) 6? 4. Without expanding, find the coefficient of x 4 in the normal form of (x 3 3x 2 5x 8)(3x 2 4x 1) (5x 5 3x 4 x 3 2x 2 x 7). 5. Find the coefficient of the given term in the normal form of the given polynomial. a. x 6 ; (x 1) 6 b. x 7 ; (x 1) 7 c. x 10 ; (x 1) 10 d. x 101 ; (x 1) Find the coefficient of each given term in the expanded form of (x y z)(x 2 xy 2y 2 3xz yz 2z 2 ). a. xyz b. x 2 y c. yz 2 d. xz 2 e. y 2 z f. xy 2 7. Expand each product. a. (1 x)(1 x x 2 ) b. (1 x)(1 x x 2 x 3 x 4 ) c. (1 x)(1 x x 2 x 3 x 4 x 5 x 6 ) 8. Find the normal form of each polynomial. a. (x 4 x 2 1)(x 1) b. (x 12 x 6 1)(x 5 x 4 x 3 x 2 x 1) c. (x 14 x 7 1)(x 6 x 5 x 4 x 3 x 2 x 1) 118

5 Additional Practice Lessons 2.10 and a. Which value of p makes the greatest possible product of (15 p) and (15 p)? Explain. b. Consider all pairs of numbers p and q such that p q 30. Which pair has the greatest possible product? 2. Solve each equation. a. y b. (y 5) c. y d. y 1 a 2 1 b a. Determine whether z (z 5 10)(z 5 10) is true. Explain. b. What is the degree of z ? c. What is the degree of z 5 10? Of z 5 10? What is the degree of their product? 4. Find all the real numbers that make each equation true. a. x b. x c. x d. x e. x f. x g. x h. x i. x Find the largest prime factor of each number. a b c d. What is the pattern? Explain. 6. Use the ZPP and what you know about factoring. Find all integer solutions. a. x 2 11x 24 b. x x c. (x 6)(x 4) 1 d. x 2 11x e. (x 3)(x 4) 6 f. (x 6)(x 4) 8 7. Determine whether each expression is a perfect square trinomial. Explain. a. x 2 42x 441 b. x 2 24x 144 c. x 2 32x 256 d. x 2 42x 441 e. x 2 24x 48 f. x 2 32x Factor each quadratic expression over. If an expression is not factorable, explain why. a. x 2 12x 36 b. x c. x 2 9x 8 d. x 2 12x 32 e. x f. x 2 9x 10 g. x 2 12x 11 h. x 2 400x 399 i. x 2 9x Solve each equation. If no solutions exist, explain why. a. x 2 12x 35 0 b. x 2 12x 20 c. x 2 12x 35 0 d. x 2 12x

6 Additional Practice Lesson What value of k makes each equation an identity? a. x 2 6x (x k) 2 9 b. x 2 8x 4 (x k) 2 12 c. x 2 7x 12 (x k) d. x 2 11x (x k) a. What value of m makes 64t 2 mt 9 a perfect square trinomial? b. What value of n makes 81t 2 90t n a perfect square trinomial? 3. Solve each polynomial equation. Use completing the square or any other method. Check your answers. a. x 2 10x b. (3x 5)(x 2) 8 c. x 2 4x 7 d. x 2 12x 1 e. x 1 x f. x 3 27 x Solve the polynomial equation x 2 12x 5 8 by completing the square. Explain your steps. 5. Solve each polynomial equation. Use completing the square or any other method. Check your answers. a. x 2 10x 20 b. x(x 12) 140 c. x 2 20x d. (x 3)(x 9) A square piece of sheet metal is 18 inches by 18 inches. You cut a small square from each of its corners to form an open-top square box with a bottom area of 196 square inches. a. Draw the square sheet. Indicate where to make cuts. b. What size squares should you cut from the corners? Show your computations. c. What is the area of the original square sheet? What is the area of each square that you cut from the piece of sheet metal? 7. Complete the square for each incomplete polynomial. a. x 2 12x b. x 2 12x c. x 2 9x d. x 2 9x e. x 2 24x f. x 2 x g. x 2 bx h. x 2 bx i. x 2 b 2 x 120

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