Question

Equação :

x (x + 4) + x ( x +2) = 2x² + 12

Answer 1

$x^{2} + 4x + x^{2} + 2x = 2x^{2} + 12 2x^{2} +6x = 2 x^{2} + 12 2 x^{2} - 2 x^{2} + 6x = 12 6x = 12 x = \frac{12}{6} x = 2$

Answer 2

 x (x + 4) + x (x +2) = 2x² + 12
 x² + 4 + x² + 2x = 2x² + 12
 x² + 4x + x² + 2x - 2x² = 12
 + 2x² - 2x² + 6x = 12
 6x = 12
 x = 12/6
 x = 2