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 - Chapter Test - Page 537: 2

Answer

The solutions are $x=3+\sqrt{19}$ and $x=3-\sqrt{19}$.

Work Step by Step

The given equation is $\Rightarrow x^2-6x=10$ The coefficient of the $x^2-$term is $1$, and the coefficient of the $x-$term is an even number. So, solve by completing the square. $\Rightarrow x^2-6x=10$ Add $(\frac{-6}{2})^2=(-3)^2=9$ to each side. $\Rightarrow x^2-6x+9=10+9$ Write the left side as the square of a binomial. $\Rightarrow (x-3)^2=19$ Take the square root of each side. $\Rightarrow x-3=\pm\sqrt{19}$ Add $3$ to each side. $\Rightarrow x-3+3=3\pm\sqrt{19}$ Simplify. $\Rightarrow x=3\pm\sqrt{19}$ The solutions are $x=3+\sqrt{19}$ and $x=3-\sqrt{19}$.
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