Question

Resolva as equaçoes do primeiro grau x( x + 4) +x ( x + 2 ) = 2x ao quadrado +12

Answer 1

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

Answer 2

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