Algebra: A Combined Approach (4th Edition)

Published by Pearson
ISBN 10: 0321726391
ISBN 13: 978-0-32172-639-1

Chapter 11 - Section 11.4 - Nonlinear Inequalities in One Variable - Exercise Set - Page 798: 24

Answer

$(3, 5)$

Work Step by Step

$(y^2+15)/8y \leq1$ Denominator is zero when $y=0$ $(y^2+15)/8y \leq1$ $(y^2+15)/8y=1$ $(y^2+15)*8y/8y=1*8y$ $y^2+15=8y$ $y^2-8y+15=0$ $(y-3)(y-5)=0$ $y-3=0$ $y=3$ $y-5=0$ $y=5$ (-infinity, $3)$ $(3, 5)$ $(5$, infinity) Let $y=1$, $y=4$, $y=10$ $y=1$ $(y^2+15)/8y \leq1$ $(1^2+15)/8*1 \leq1$ $(1+15)/8 \leq1$ $16/8 \leq 1$ $2 \leq 1$ (false) $y=4$ $(y^2+15)/8y \leq1$ $(4^2+15)/8*4 \leq1$ $(16+15)/32 \leq1$ $31/32 \leq 1$ (true) $y=10$ $(y^2+15)/8y \leq1$ $(10^2+15)/8*10 \leq1$ $(100+15)/80 \leq1$ $115/80 \leq 1$ (false)
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