Algebra: A Combined Approach (4th Edition)

Published by Pearson

Chapter 11 - Section 11.1 - Solving Quadratic Equations by Completing the Square - Exercise Set: 15

Answer

$x=\pm3i$

Work Step by Step

$x^{2}+9=0$ Take the $9$ to substract to the right side of the equation: $x^{2}=-9$ Take the square root of both sides of the equation: $\sqrt{x^{2}}=\sqrt{-9}$ $x=\pm3i$

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