Precalculus (10th Edition)

Published by Pearson
ISBN 10: 0-32197-907-9
ISBN 13: 978-0-32197-907-0

Appendix A - Review - A.6 Solving Equations - A.6 Assess Your Understanding - Page A51: 53

Answer

$\{-1,\frac{3}{2}\}$

Work Step by Step

Recall that $|a|=b \implies a=b$ or $a=-b$. Thus, using the rule above yields: $1-4t=5\quad$ or $\quad 1-4t=-5$ Subtract $1$ from both sides of each equation. $1-4t-1=5-1\quad$ or $\quad1-4t-1=-5-1$ Simplify. $-4t=4\quad$ or $\quad-4t=-6$ Divide both sides of both equations by $-4$. $\dfrac{-4t}{-4}=\dfrac{4}{-4}\quad$ or $\quad\dfrac{-4t}{-4}=\dfrac{-6}{-4}$ Simplify. $t=-1\quad$ or $\quad t=\frac{3}{2}$ Hence, the solution set of the given equation is $\{-1,\frac{3}{2}\}$.
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