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: 26

Answer

a. $x=\pm \sqrt 3$ b. $x=1$ c. $x=0$ or $x=3$ d. $(-\sqrt 3,\sqrt 3)$ e. $x\geq 1$ f. $(0,3)$ g. $[-\sqrt 2,\sqrt 2]$

Work Step by Step

$f(x)=-x^2+3,$ $g(x)=-3x+3,$ a. $-x^2+3=0,$ $-x^2=-3,$ $x^2=3,$ $x=\pm \sqrt 3$ b. $g(x)=-3x+3=0,$ $-3x+3=0,$ $-3x=-3,$ $x=1$ c. $-x^2+3=-3x+3,$ $-x^2+3x=0,$ $-x(x-3)=0,$ $x=0$ or $x=3$ d. $-x^2+3>0,$ $-x^2>-3,$ $x^2<3,$ $x<\pm \sqrt 3$ e. $g(x)\leq 0,$ $-3x+3\leq 0,$ $-3x\leq -3,$ $x\geq 1,$ f. $-x^2+3>-3x+3,$ $-x^2+3x>0,$ $x(x-3)<0,$ $x\in (0,3)$ g. $-x^2+3\geq 1,$ $-x^2+2\geq 0,$ $-x^2\geq -2,$ $x^2 \leq 2$
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