Big Ideas Math - Algebra 1, A Common Core Curriculum

Published by Big Ideas Learning LLC
ISBN 10: 978-1-60840-838-2
ISBN 13: 978-1-60840-838-2

Chapter 9 - Solving Quadratic Equations - 9.5 - Solving Quadratic Equations Using the Quadratic Formula - Monitoring Progress - Page 516: 1

Answer

$x=5$ and $x=1$

Work Step by Step

The given equation is $\Rightarrow x^2-6x+5=0$ Standard equation. $\Rightarrow ax^2+bx+c=0$ We have $a=1,b=-6$ and $c=5$ Quadratic formula. $\Rightarrow x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}$ Substitute all the values into the formula. $\Rightarrow x=\frac{-(-6)\pm\sqrt{(-6)^2-4(1)(5)}}{2(1)}$ Clear the parentheses. $\Rightarrow x=\frac{6\pm\sqrt{36-20}}{2}$ Simplify. $\Rightarrow x=\frac{6\pm\sqrt{16}}{2}$ Evaluate the square root. $\Rightarrow x=\frac{6\pm4}{2}$ The solutions are. $\Rightarrow x=\frac{6+4}{2}$ and $x=\frac{6-4}{2}$ Simplify. $\Rightarrow x=5$ and $x=1$.
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