hatinh 16/03/2022 x × (x+4) + x × (x+2) = 2x² + 12x² + 4x + x² + 2x = 2x² + 122x² + 6x = 2x² + 126x = 12x = 12/6x = 2
hatinh
x × (x+4) + x × (x+2) = 2x² + 12
x² + 4x + x² + 2x = 2x² + 12
2x² + 6x = 2x² + 12
6x = 12
x = 12/6
x = 2