Question

x (x+4)+x (x+2)=2x+12

Answer 1

X + 4x + X - 2x = 2x + 12
X + 4x + X - 2x = 12
5x + X = 12
6x = 12

Answer 2

x*(x+4) + x*(x+2) = 2x + 12
x² + 4x + x² + 2x = 2x +12
2x² + 4x - 12 = 0
x² + 2x - 6 = 0
Δ = 28
x = (-2 ± √28) / 2
x¹ = (-2 ± 2√7) / 2
x² = (2 ± 2√7) / 2