Algebra 2 Common Core

Published by Prentice Hall
ISBN 10: 0133186024
ISBN 13: 978-0-13318-602-4

Chapter 4 - Quadratic Functions and Equations - 4-8 Complex Numbers - Practice and Problem-Solving Exercises - Page 253: 40

Answer

$x=\dfrac{1-i\sqrt{35}}{6} \text{ OR } x=\dfrac{1+i\sqrt{35}}{6} $

Work Step by Step

In the given equation, \begin{align*} -3x^2+x-3=0 ,\end{align*} $a= -3 ,$ $b= 1 ,$ and $c= -3 .$ Using the Quadratic Formula which is given by $x=\dfrac{-b\pm\sqrt{b^2-4ac}}{2a},$ then \begin{align*}\require{cancel}x&= \dfrac{-1\pm\sqrt{1^2-4(-3)(-3)}}{2(-3)} \\\\&= \dfrac{-1\pm\sqrt{1-36}}{-6} \\\\&= \dfrac{-1\pm\sqrt{-35}}{-6} \\\\&= \dfrac{-1\pm\sqrt{-1}\cdot\sqrt{35}}{-6} \\\\&= \dfrac{-1\pm i\sqrt{35}}{-6} &\text{ (use $i=\sqrt{-1}$)} \\\\&= \dfrac{\cancel{-1}^1\pm i\sqrt{35}}{\cancel{-6}^6} &\text{ (divide by $-1$)} \\\\&= \dfrac{1\pm i\sqrt{35}}{6} .\end{align*} The solutions are $ x=\dfrac{1-i\sqrt{35}}{6} \text{ and } x=\dfrac{1+i\sqrt{35}}{6} .$
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