Question

como resolve essa equacao x²=x+12?

Answer 1

$x^2=x+12\\ \\ x^2-x-12=0\\ \\ \Delta=(-1)^2-4.1.(-12)=1+48=49\\ \\ x=\frac{1\pm\sqrt{49}}{2}=\frac{1 \pm 7}{2}\\ \\ x_1=\frac{1-7}{2}=-3\\ \\ x_2=\frac{1+7}{2}=4$