Question

$x^2 - 9 = 0$

Explanation:

Step1: Isolate \( x^2 \)

Add 9 to both sides: \( x^2 - 9 + 9 = 0 + 9 \) → \( x^2 = 9 \)

Step2: Take square roots

Take square root of both sides: \( x = \pm\sqrt{9} \) → \( x = \pm 3 \)

Answer:

\( x = 3 \) or \( x = -3 \)