College Algebra 7th Edition

Published by Brooks Cole
ISBN 10: 1305115546
ISBN 13: 978-1-30511-554-5

Chapter P, Prerequisites - Chapter P Test - Page 79: 9

Answer

$\textbf{(a)}(2x-5)(2x+5)$ $\textbf{(b)}(2x-3)(x+4)$ $\textbf{(d)}x(x+3)(x^2-3x+9)$ $\textbf{(e)}\bigg((2x-y)-5\bigg)^2$ $\textbf{(f)} xy(x-2)(x+2)$

Work Step by Step

$\textbf{(a)} 4x^2-25=(2x-5)(2x+5)$ $\textbf{(b)} 2x^2+5x-12=(2x-3)(x+4)$ $\textbf{(d)} x^4+27x=x(x^3+27)=x(x+3)(x^2-3x+9)$ $\textbf{(e)} (2x-y)^2-10(2x-y)+25=\bigg((2x-y)-5\bigg)^2$ $\textbf{(f)} x^3y-4xy=xy(x^2-4)=xy(x-2)(x+2)$
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