Intermediate Algebra (12th Edition)

Published by Pearson
ISBN 10: 0321969359
ISBN 13: 978-0-32196-935-4

Chapter 8 - Section 8.1 - The Square Root Property and Completing the Square - 8.1 Exercises: 35

Answer

$p=\left\{ \dfrac{-1-2\sqrt{6}}{4},\dfrac{-1+2\sqrt{6}}{4} \right\}$

Work Step by Step

$\bf{\text{Solution Outline:}}$ To solve the given equation, $ (4p+1)^2=24 ,$ take the square root of both sides (Square Root Property) and simplify the radical. Then use the properties of equality to isolate the variable. $\bf{\text{Solution Details:}}$ Taking the square root of both sides (Square Root Property), the equation above is equivalent to \begin{array}{l}\require{cancel} 4p+1=\pm\sqrt{24} .\end{array} Simplifying the radical and then using the properties of equality to isolate the variable, the equation above is equivalent to \begin{array}{l}\require{cancel} 4p+1=\pm\sqrt{4\cdot6} \\\\ 4p+1=\pm\sqrt{(2)^2\cdot6} \\\\ 4p+1=\pm2\sqrt{6} \\\\ 4p=-1\pm2\sqrt{6} \\\\ p=\dfrac{-1\pm2\sqrt{6}}{4} .\end{array} The solutions are \begin{array}{l}\require{cancel} p=\dfrac{-1-2\sqrt{6}}{4} \\\\\text{OR}\\\\ p=\dfrac{-1+2\sqrt{6}}{4} .\end{array} Hence, $ p=\left\{ \dfrac{-1-2\sqrt{6}}{4},\dfrac{-1+2\sqrt{6}}{4} \right\} .$
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