Question

as raízes ou zero da fundação y=×2+2×-15 sao

Answer 1

$\Delta=4+60=64$

$x=\frac{-2±8}{2}$

$\color{red}{x'=\frac{-2+8}{2}=\frac{6}{2}=3}\\\color{blue}{x''=\frac{-2-8}{2}=-\frac{10}{2}=-5}$