College Algebra (10th Edition)

Published by Pearson
ISBN 10: 0321979478
ISBN 13: 978-0-32197-947-6

Chapter 4 - Section 4.5 - Inequalities involving Quadratic Functions - 4.5 Assess Your Understanding - Page 314: 30

Answer

a. $x=1$ b. $x=\pm 1$ c. $x=0$ or $,x=1$ d. $x\not=1$ e. $x\leq -1,x\geq 1$ f. $x<0$ or $x>1$ g. $x\leq0$ or $x\geq 2$

Work Step by Step

$f(x)=x^2-2x+1,$ $g(x)=-x^2+1,$ a. $x^2-2x+1=0,$ $x^2-x-x+1=0,$ $x(x-1)-1(x-1)=0,$ $(x-1)^2=0,$ $x=1$ b. $-x^2+1=0,$ $x^2=1,$ $x=\pm 1$ c. $x^2-2x+1=-x^2+1,$ $2x^2-2x=0,$ $2x(x-1)=0,$ $x=0$ or $x-1=0,x=1$ d. $x^2-2x+1>0,$ $(x-1)^2>0,$ $x\not=1$ e. $-x^2+1\leq 0,$ $-x^2\leq -1,$ $x^2\geq 1,$ $x \leq -1,x\geq 1$ f. $x^2-2x+1>-x^2+1,$ $2x^2-2x>0,$ $2x(x-1)>0,$ $x<0$ or $x>1,$ g. $f(x)\geq1,$ $x^2-2x+1\geq 1,$ $x^2-2x\geq 0,$ $x(x-2)\geq 0,$ $x\leq0$ or $x\geq 2$
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