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Mth 098 practice problems, Test 3 SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. Find the product. 1) -7x(6x + 1) 2) -3x5(-4x9 + 10x7 + 12) 3) (4p - 1)(16p2 + 4p + 1) 4) (-5 + x)(5x - 6) 5) (x - 12y)(x + 5y) 6) 2y3(2y + 5)(y - 5) Name: _____________________ Date: ___ Simplify the expression. Use positive exponents. Assume variables represent nonzero real numbers. y-9 16) 17) t3 t6 18) t-3 t-8 19) 2 r-4 20) 8x6 2x3 Find the square. 7) ( 2 a - 1 )2 8) ( 10 x - 3 y)2 Use a combination of rules for exponents to simplify. Write answers with only positive exponents. Assume that all variables represent nonzero real numbers. 21) t -8 · t 2 · t -4 Find the product. 9) (x + 3 )(x - 3 ) 10) ( 7 a y3 + 10c)( 7 a - 10c) Evaluate. 11) 20 Simplify the expression. Use positive exponents. Assume variables represent nonzero real numbers. 8x6 12) -80 22) Evaluate the expression. 1 -3 13) 5 2x4 Use a combination of rules for exponents to simplify. Write answers with only positive exponents. Assume that all variables represent nonzero real numbers. 3m -2 14) 2-3 15) -4-3 23) 1 6m -3 24) 25) tz-2 -4 t-3z 36) 14m3, Factor out the greatest common factor. 37) 8x9y9 + 8x7y4 - 20x3y2 2p-3q 2 3-1m3 38) 17m2 Perform the division. Write the answer with positive exponents. 10x10 - 40x6 26) 27) 41) 8a3 - 6a2b - 20ab2 + 15b 3 42) 16r2 Write the number in scientific notation. 28) 550,000 + 56ry - 2xr - 7xy Factor completely. 43) x2 - 9x - 22 29) .00003323 44) 4x2 30) 6,100,000 Perform the division. Write the answer with positive exponents. 12x12 + 24x11 - 9x9 + 15x7 + 4x6 3x9 Write the number without exponents. 32) 3.295 × 107 - 4x - 24 45) x3 - x2 - 56x 46) x2 - x - 12 47) u2 - 3uv - 28v2 48) x2 - 3xy - 28y2 Factor as completely as possible. If unfactorable, indicate that the polynomial is prime. 49) 9x2 + 24x + 16 × 10-5 Find the greatest common factor of the terms. 34) 6x, 9 35) 88x2, + 18x2y5 Factor by grouping. 40) 24x2 - 20x + 18x - 15 9x6 +3x5 + 15x4 3x5 33) 5.899 - 10r3 39) 3x2y6 5x2 31) 56m8 44x7 2 50) 6z 2 - 5z - 6 51) 8x2 + 14xt + 3t 2 52) 12z2 - 7z - 12 53) 16x2 - 24xt + 9t2 54) 9x2 - 39x - 30 55) 8y2 + 36y - 20 56) -x2 - 2x + 8 57) -2a2 Solve the problem. 70) The diagram below shows the side view of a plan for a slanted roof. Find the unknown length in this roof plan. Round approximations to the nearest tenth. 10 ft 17 ft - 11ab - 5b 2 71) A painter leans a ladder against one wall of a house. The ladder is 19 ft long. The base of the ladder is 15 ft from the house. How high is the wall? Round approximations to the nearest tenth. Factor completely. 58) 9x2 - 25 59) 9s2 - 100t4 60) 8x2 -2 61) 49x2 ? + 36 15 ft Solve the equation. 62) (x - 3)(x + 2) = 0 63) x(6x 64) b(b 65) x2 72) Use the Pythagorean formula to solve each problem. The longer leg of a right triangle is 1 m longer than the shorter leg. The hypotenuse is 1 m shorter than twice the shorter leg. Find the length of the shorter leg of the triangle. + 18) = 0 + 13) = 0 -x= 6 66) 5x2 67) x(x - 30x + 40 = 0 - 3) = 28 68) 8m2 69) 8r2 19 ft - 6m = 0 = 2r 3 Answer Key Testname: 098 TEST 3 PRACTICE PROB 1) -42x2 - 7x 2) 12x14 - 30x12 - 36x5 35) 44x2 36) 14m 3 3) 64p3 - 1 4) 5x2 - 31x + 30 37) 4x3 y2 (2x6 y7 + 2x4 y2 - 5) 38) No common factor (except 1) 39) 3x2 y5 (y + 6) 5) x2 - 7xy - 60y2 6) 4y5 - 10y4 - 50y3 40) (4x + 3)(6x - 5) 41) (2a 2 - 5b2 )(4a - 3b) 7) 4 a 2 - 4 a + 1 8) 100 x2 - 60 xy + 9 y2 42) (2r + 7y)(8r - x) 43) (x + 2)(x - 11) 44) 4(x + 2)(x - 3) 45) x(x + 7)(x - 8) 46) (x + 3)(x - 4) 47) (u + 4v)(u - 7v) 48) (x - 7y)(x + 4y) 49) (3x + 4)(3x + 4) 50) (3z + 2)(2z - 3) 51) (4x + t)(2x + 3t) 52) (4z + 3)(3z - 4) 53) (4x - 3t)(4x - 3t) 54) 3(3x + 2)(x - 5) 55) 4(2y - 1)(y + 5) 56) -(x - 2)(x + 4) 57) -(a + 5b)(2a + b) 9) x2 - 9 10) 49 a 2 - 100 c2 11) 1 12) -1 13) 125 1 14) 8 15) - 1 64 16) 1 y12 17) 1 t3 58) (3x + 5)(3x - 5) 59) (3s + 10t2 )(3s - 10t2 ) 18) t5 19) 2r4 20) 4x3 21) 60) 2(2x - 1)(2x + 1) 61) Prime 62) 3, -2 63) 0, -3 64) -13, 0 65) -2, 3 66) 2, 4 67) -4, 7 3 68) , 0 4 1 t10 22) 4x2 63m 23) 32 24) 25) z 12 t16 36q2 p6 m 6 69) 0, 70) 19.7 ft 71) 11.7 ft 26) 2x8 - 8x4 5 27) 3x + 6 + x 72) 3m 28) 5.5 × 105 29) 3.323 × 10-5 30) 6.1 × 106 31) 4x3 + 8x2 - 3 + 1 4 5 x2 + 4 3x3 32) 32,950,000 33) .00005899 34) 3 4