Answer
$x=\pm1$
Work Step by Step
The only unknown term is $x^2$, so solve the equation using taking square root:
$$9x^2-5=4$$
$$9x^2=4+5$$
$$9x^2=9$$
$$x^2=1$$
$$x=\pm\sqrt1=\pm1$$
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 - 9.5 - Solving Quadratic Equations Using the Quadratic Formula - Monitoring Progress - Page 520: 14
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