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MTH 100 Test 4 Practice Problems Spring 2014 Find an equation of the line that satisfies the conditions. Write the equation in slope-intercept form. 3 1) Through (2, 3); m = 8 10) -5x - 7y = -32 -2x + 2y = 16 Find the product. 11) (10m + 3)2 2) Through (4, 5); m = 3 12) (5x - 8y) 2 Solve the problem. 3) Find f(-4) when f(x) = 5x2 + 2x + 5. 4) Find f(-2) when f(x) = Factor the trinomial completely. 13) x2 + 4xy - 12y2 3x + 5 2 x 14) 16x2 + 24x + 9 5) Find f(x + h) when f(x) = 3x2 - 4x + 5. 15) 15z 2 - 4z - 4 Simplify the expression so that no negative exponents appear in the final result. Assume all variables represent nonzero numbers. 2x3 y-3 -3 6) x-5 y2 7) Factor the polynomial completely. 16) 64y4 - 81 17) 25x2 + 9 18) 125a 3 - 27b3 3x4 y2 3 9xy2 19) 8s3 + 1 8) y = 3 x+7 5 20) 250k3 m - 128m 4 y 10 21) 64y6 - 49 5 -10 -5 5 10 Simplify the complex fraction. y 3 22) 7 y- 7 x -5 4+ -10 23) Solve the system of equations. 9) -7x + 7y = 14 4x + 5y = 28 1 2 x x 1 + 3 6 24) 25) 64x2 - 16y2 xy 36) 8 4 y x 37) -27 4 - 1296 Simplify the root. 3 38) x3 x-2 x-2 - y-2 Add or subtract as indicated. Write the answer in lowest terms. 2 6 26) + r r- 7 27) 3 39) 40) 3 7 + 2 2 y - 3y + 2 y - 1 x16 3 x21 Simplify the expression involving rational exponents. 41) 676 1/2 Solve the problem. Round your answer, as needed. 28) The distance of an object from a fulcrum is DW given by d = . Find D if d = 3, w = 7, and w 42) 815/4 43) (-16)1/2 W = 2. 44) - 29) A formula for the focal length of a lens is ab f= b+a 25 1/2 36 45) 27-4/3 Calculate f (the focal length) for a = 14 cm and b = 20 cm. Write with radicals. Assume that all variables represent positive real numbers. 46) (mn)1/5 Solve the formula for the specified variable. 1 30) V = Bh for h 3 47) (9py2 )1/7 Gm1 m 2 31) F = for G d2 Simplify by first converting to rational exponents. Assume that all variables represent positive real numbers. 4 48) 3 16 Find the root if it is a real number. 32) 36 33) -196 49) u40 34) 441 16 50) z6 35) - 3 51) 64 2 4 4y10 Use the rules of exponents to simplify the expression. Write the answer with positive exponents. Assume that all variables represent positive real numbers. 52) (b4 )3/4 67) 54) (8k3 m -6 )1/3 Find the distance between the pair of points. 69) (1, 5) and (-6, -6) 55) (256h 14k16)3/2 70) (-5, 5) and (5, -7) x3/5 x6/5 · x-5 Simplify. Assume that all variables represent positive real numbers. 71) 64 + 81 Multiply using the product rule. 4 4 57) 5 · 25 72) 2 74) 7 25 64 75) 3 62) 3 63) 66) 3 3 3 3+5 3 3x2 3 125x + 3 3 27x Multiply, then simplify the product. Assume that all variables represent positive real numbers. 77) 6( 216 - 96) 24 320 78) (5 + -108 79) ( 3x + 3)( 7x - 3) Express the radical in simplified form. Assume that all variables represent positive real numbers. 64) 384x2 65) - 150 3 3 76) 20 2 - 5 250 Express the radical in simplified form. 60) 108 61) - 6 +9 73) 6 48x2 - 2 27x2 - Simplify the radical. Assume that all variables represent positive real numbers. 15 58) r4 59) 8k9 Simplify the radical. Assume that all variables represent positive real numbers. 4 68) 802 53) x1/7 · x6/7 56) 3 5)2 80) ( 5 + 1)( 5 - 1) Rationalize the denominator. Assume that all variables represent positive real numbers. 8 81) 3 12k7 q8 -64a 8 b5 3 82) 8z 7 96) Rationalize the denominator. Assume that all variables represent positive real numbers and that the denominator is not zero. 3 83) 9- 2 84) 5 5 6- 5 85) 55+ -12 -4 Add or subtract as indicated. Write your answer in the form a + bi. 97) (3 - 4i) + (6 + 7i) 98) (9 + 8i) - (2 + 8i) + (9 + 2i) Multiply. 99) 9i(9 - 8i) 100) (8 - 3i)(3 + 2i) 2 2 101) (8i)(-4i) Write the expression in lowest terms. Assume that all variables represent positive real numbers. 45 - 81 15 86) 63 102) i(6 - 3i)(8 - 3i) Write the expression in the form a + bi. 2 103) 5 - 3i Solve the equation. Do not forget you have to show the check for each answer you get. 87) q + 5 = 6 88) 6a - 5 - 89) p2 - 3p + 49 = p + 4 90) x2 + 4x + 24 + 3 = x 91) 92) 4 4 + 3i 5 + 3i 105) -2i 4 - 3i 106) 1 - 7i 5 - 3i 4a + 8 = 0 Use the zero-factor property to solve the equation. 107) x2 + 2x - 15 = 0 x+2+7=0 3x + 1 = 3 + x-4 Use the square root property to solve the equation. 108) x2 = 49 Write the number as a product of a real number and i. Simplify the radical expression. 93) -9 94) 104) 109) (p - 3)2 = 7 Solve the equation by completing the square. 110) p2 + 3p - 9 = 0 -250 Multiply or divide as indicated. 95) -49 · -25 Find the nonreal complex solutions of the equation. 111) x2 + 4x + 53 = 0 4 Use the quadratic formula to solve the equation. (All solutions are real numbers.) 112) 2n 2 = -10n - 7 113) 3x(x - 1) = 8 114) x2 = 9 - 4x Use the quadratic formula to solve the equation. 115) 2x2 = -5x - 7 116) 8x2 + 7x = -2 117) 5x2 + 9x + 10 = 0 5 Answer Key Testname: MTH 100 TEST 4 PRACTICE SPRING 2014 1) Use y-y1 =m(x-x1 ) 3 y-3 = - (x - 2) and simplify. 8 3 15 y=- x+ 8 4 2) y = 3x - 7 3) 77 1 4) 2 26) 8r - 14 r(r - 7) 27) 10y - 11 (y - 1)(y + 1)(y - 2) 31) G = 7) 3x11y4 3 8) Slope: 5 Fd2 m1m2 32) 6 33) Not a real number 21 34) 4 y 35) -4 36) -3 37) Not a real number 38) x 39) x8 10 5 -5 y2 y2 - x2 28) 10.5 29) 8.2 cm 3V 30) h = B 5) 3x2 +6xh+3h 2 -4x-4h+5 y15 6) 8x24 -10 25) 5 10 40) x7 x 41) 26 42) 243 43) Not a real number 5 44) 6 -5 -10 1 81 9) {(2, 4)} 10) {(-2, 6)} 11) 100m 2 + 60m + 9 45) 12) 25x2 - 80xy + 64y2 13) (x + 6y)(x - 2y) 14) (4x + 3)(4x + 3) 15) (3z - 2)(5z + 2) 16) (8y2 + 9)(8y2 - 9) 7 47) 9py2 48) 81 49) u20 17) Prime 51) 46) 5 mn 50) z 3 2y5 52) b3 18) (5a - 3b)(25a 2 + 15ab + 9b2 ) 19) (2s + 1)(4s2 - 2s + 1) 53) x 2k 54) m2 20) 2m(5k - 4m)(25k2 + 20km + 16m 2 ) 21) (8y3 - 7)(8y3 + 7) 22) y(y - 7) 21 55) 4096h 21k24 56) x22/5 23) 12 x 57) 24) 8x + 4y 6 4 125 Answer Key Testname: MTH 100 TEST 4 PRACTICE SPRING 2014 58) 59) 90) ∅ 91) ∅ 92) {5, 8} 15 r2 5 8 93) 3i 94) 5i 10 95) -35 96) 3 97) 9 + 3i 98) 16 + 2i 60) 6 3 61) -2 6 3 62) 4 5 63) Not a real number 64) 8x 6 65) -2k3 q4 3k 99) 72 + 81i 100) 30 + 7i 101) 32 3 66) -4a 2 b a 2 b2 67) 2k3 102) 42 + 39i 5 3 103) i + 17 17 68) 4 5 69) 170 70) 2 61 71) 17 72) 47 6 73) 17x 3 3 74) 12 3 75) 24 x 3 76) -5 2 77) 12 78) 30 + 10 5 79) x 21 - 3 3x + 3 7x - 9 83) 27 + 3 2 79 84) 30 + 1 29 6 8 i 25 25 106) 13 16 i 17 17 113) 3+ 6 105 3 , 105 6 114) {-2 + 13, -2 - 13} -5 + i 31 -5 - i 31 115) , 4 4 27 - 10 2 85) 23 86) 105) 111) {-2 + 7i, -2 - 7i} -5 + 11 -5 - 11 112) , 2 2 80) 4 8 3 81) 3 8z 7 7 29 3 i + 34 34 107) {-5, 3} 108) {7, -7} 109) 3 + 7, 3 - 7 -3 + 3 5 -3 - 3 5 110) , 2 2 3 82) 104) 5 - 9 15 7 87) {31} 13 88) 2 89) {3} 7 116) -7 + i 15 -7 - i 15 , 16 16 117) -9 + i 119 -9 - i 119 , 10 10