### Home > CCA > Chapter 9 > Lesson 9.1.2 > Problem9-18

9-18.

Use the Quadratic Formula to solve x2 − 13x + 42 = 0. Did your solution match the solution from part (a) of problem 9-17? Homework Help ✎

$\textit{x}=\frac{-\textit{b}\pm\sqrt{\textit{b}^2-4\textit{ac}}}{2\textit{a}}$
$\textit{x}=\frac{-(-13)\pm\sqrt{(-13)^2-4(1)(42)}}{2(1)}$
$\frac{13 + \sqrt{1}}{2}\text{ or }\frac{\left(13-\sqrt{1}\right)}{2}$