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: 49

Answer

$x=${$2- 2i\sqrt 2,2+2i\sqrt 2$}

Work Step by Step

Given: $x^2+10=2(2x-1)$ Re-write the given equation as: $x^2+10=4x-2$ This implies that $x^2-4x+12=0$ 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 $x=\dfrac{-(-4) \pm \sqrt{(-4)^2-4(1)(12)}}{2(1)}$ or, $x=\dfrac{4 \pm \sqrt {-32}}{2}$ or, $x=${$\dfrac{4- 4i\sqrt 2}{2},\dfrac{4+ 4i\sqrt 2}{2}$} Hence, our solution set is: $x=${$2- 2i\sqrt 2,2+2i\sqrt 2$}
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