Intermediate Algebra for College Students (7th Edition)

Published by Pearson
ISBN 10: 0-13417-894-7
ISBN 13: 978-0-13417-894-3

Chapter 8 - Section 8.2 - The Quadratic Formula - Exercise Set - Page 608: 48

Answer

$x=${$1,\dfrac{5 }{7}$}

Work Step by Step

Given: $7x(x-2)=3-2(x+4)$ Re-write the given equation as: $7x^2-14x=3-2x-8$ This implies that $7x^2-12x+5=0$ Factorize the expression with the help of quadratic formula. Quadratic formula suggests that $x=\dfrac{-b \pm \sqrt{b^2-4ac}}{2a}$ This implies that $x=\dfrac{-(-12) \pm \sqrt{(-12)^2-4(7)(5)}}{2(7)}$ or, $x=\dfrac{12 \pm \sqrt {4}}{14}$ or, $x=${$\dfrac{12+- 2}{14},\dfrac{12-2}{14}$} Hence, our solution set is: $x=${$1,\dfrac{5 }{7}$}
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