Question

2x(x+1) =x(x+5+3(12-x)​

Answer 1

Olá!

\begin{gathered}2x(x + 1) = x(x + 5) + 3(12 - x) \\ 2 {x}^{2} + 2x = {x}^{2} + 5x + 36 - 3x \\ 2 {x}^{2} - {x}^{2} + 2x - 5x + 3x = + 36 \\ {x}^{2} = 36\end{gathered}

2x(x+1)=x(x+5)+3(12−x)

2x

2

+2x=x

2

+5x+36−3x

2x

2

−x

2

+2x−5x+3x=+36

x

2

=36

x = ± √36

x = ± 6

S = {- 6, + 6}

Espero ter ajudado! :)