Math

Solve for x:
(x + 3)^2 = x^2 + 9

Subtract x^2 + 9 from both sides:
-9 - x^2 + (x + 3)^2 = 0

Expand out terms of the left hand side:
6 x = 0

Divide both sides by 6:
Answer: |x = 0

(x + 3)^2 → x^2 + 6x + 9