Calculus: Early Transcendentals 8th Edition

Published by Cengage Learning
ISBN 10: 1285741552
ISBN 13: 978-1-28574-155-0

Diagnostic Tests - A Diagnostic Tests: Algebra - Page xxvi: 4

Answer

(a) $(2x+5)(2x-5)$ (b) $(2x-3)(x+4)$ (c) $(x-2)(x-3)(x+2)$ (d) $(x)(x+3)(x^2-3x+9)$ (e) $(3x^{-1/2})(x-2)(x-1)$ (f) $(xy)(x+2)(x-2)$

Work Step by Step

(a) $4x^2-25$ $= (2x+5)(2x-5)$ (b) $2x^2+5x-12$ $= (2x-3)(x+4)$ (c) $x^3-3x^2-4x+12$ $= (x-2)(x^2-x-6)$ $= (x-2)(x-3)(x+2)$ (d) $x^4+27x$ $= (x)(x^3+27)$ $= (x)(x+3)(x^2-3x+9)$ (e) $3x^{3/2}-9x^{1/2}+6x^{-1/2}$ $= (3x^{-1/2})(x^2-3x+2)$ $= (3x^{-1/2})(x-2)(x-1)$ (f) $x^3y-4xy$ $= (xy)(x^2-4)$ $= (xy)(x+2)(x-2)$
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