Question

(12+x)x(9+x)=270 alguém sabe resolver ?

Answer 1

(12+x).(9+x)=270
108+12x+9x+x^{2}=270
x^{2}+21x-162=0
Δ=21^{2}-4.1.-162
441+648=1.089

x=$\frac{-21+/-33}{2}$
$x_{1}$=6
$x_{2}=27$