Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter 1 - Equations and Inequalities - Quiz - Page 123: 8

Answer

$$x=\frac{1}{6}\pm\frac{\sqrt{11}}{6}i$$

Work Step by Step

To solve for $x$ first rewrite in standard quadratic equation form: $ax^2 + bx +c=0$ $3x^2-x+1=0$ where $a=3$, $b=-1$, and $c=1$ now, apply the quadratic formula: $x=\dfrac{-b\pm\sqrt{b^2-4ac}}{2a}$ $$x=\frac{(-)(-1)\pm\sqrt{(-1)^2-4(3)(1)}}{2(3)}$$ $$x=\frac{1\pm\sqrt{1-12}}{6}$$ $$x=\frac{1\pm\sqrt{-11}}{6}$$ $$x=\frac{1\pm(i)\sqrt{11}}{6}$$ rewrite in standard form $a + bi$ $$x=\frac{1}{6}\pm\frac{\sqrt{11}}{6}i$$
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