Answer
$x=20$ and $x=-20$
Work Step by Step
The given equation is
$\Rightarrow x^2=400$
Take the square root of each side.
$\Rightarrow x=\pm\sqrt {400}$
Simplify.
$\Rightarrow x=\pm 20$
Hence, the solutions are $x=20$ and $x=-20$.
Big Ideas Math - Algebra 1, A Common Core Curriculum
by Larson, Ron; Boswell, Laurie
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 - 9.3 - Solving Quadratic Equations Using Square Roots - Exercises - Page 501: 6
Update this answer!
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.
