Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter 2 - Cumulative Review Exercises - Page 435: 8

Answer

The equation has the solutions $\frac{5+\sqrt{13}}{6},\frac{5-\sqrt{13}}{6}$.

Work Step by Step

The provided quadratic equation is $3{{x}^{2}}-5x+1=0$. Here, $a=3$ , $b=-5$ , and $c=1$ $\begin{align} & D={{\left( -5 \right)}^{2}}-4\left( 3 \right)\left( 1 \right) \\ & =25-12 \\ & =13 \end{align}$ Therefore, $\begin{align} & x=\frac{-\left( -5 \right)\pm \sqrt{13}}{2\left( 3 \right)} \\ & =\frac{5\pm \sqrt{13}}{6} \end{align}$ Thus, $x=\frac{5+\sqrt{13}}{6}$ or $x=\frac{5-\sqrt{13}}{6}$.
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