Question

Ariana solved the equation as shown. Explain her error and correct the solution.

9x² - 144= 0
9x² = 144
x² = 16
√ x² = √ 16
x=+8

Answer 1

Answer is the last step when Ariana solved the square roots of x^2 and 16

The square root of 16 = +4 and -4

Ariana divided 16 by 2