Intermediate Algebra: Connecting Concepts through Application

Published by Brooks Cole
ISBN 10: 0-53449-636-9
ISBN 13: 978-0-53449-636-4

Chapter 8 - Radical Functions - 8.4 Solving Radical Equations - 8.4 Exercises - Page 655: 81

Answer

$t=7.25$, $t=-8 $

Work Step by Step

Given \begin{equation} 4 t^2+3 t=232. \end{equation} This is a quadratic equation because of the square term. Solve it using the quadratic formula. \begin{equation} \begin{aligned} 4 t^2+3 t&=232 \\ 4 t^2+3 t-232&= 0\\ ax^2+bx+c&=0\\ a & =4,\ b=3,\ c=-232 \\ t & =\frac{-b \pm \sqrt{b^2-4 a c}}{2 a} \\ t & =\frac{-(3) \pm \sqrt{(3)^2-4 \cdot 4 \cdot(-232)}}{2 \cdot 4} \\ & =\frac{-3 \pm 61}{8} \\ \Longrightarrow t& =\frac{-3+ 61}{8}\\ &= 7.25\\ t& =\frac{-3 -61}{8} \\ &= -8. \end{aligned} \end{equation} The solution is $t=7.25$, $t=-8 $.
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