Question

2x(x+1)=x(x+5)+3(12-x) ajuda por favor ;-;

Answer 1

$2x(x+1)=x(x+5)+3(12-x)\\2x^2+2x=x^2+5x+36-3x\\2x^2-x^2+2x-5x+3x-36=0\\x^2-36=0\\x^2=36\\x=\pm\sqrt{36}\\x_1=+6\\x_2=-6$



Espero ter ajudado.
Bons estudos! :)