Question

resolva até 11:00 2x(x+1)=x(x+5)+3(12-x)

Answer 1

$2x(x + 1) = x(x + 5) + 3(12 - x) \\ 2 {x}^{2} + 2x = {x}^{2} + 5x + 36 - 3x \\ {x}^{2} = 36 \\ x = \frac{ + }{ } \: 6$

então x=6 ou x=-6