Question

(2x + 3)² - 9 =12x mandem junto a conta

Answer 1

2x + 9 - 9 = 12x
2x 0 - 12x
2x - 12x 0
-10x 0 (x-1)
10x 0 

Espero ter lhe ajudado.

Answer 2

(2x+3)²-9=12x
4x+9-9=12x
4x-12x=-9+9
-8x=0
x=0/8
x=0