Question

determine o vertice da parabola y = -x²+2x+3

Answer 1

$V=(-\frac{b}{a},-\frac{\Delta}{4a})$
$a=-1$
$b=2$
$c=3$
$\Delta=b^2-4ac=4-4(-1)(3)=4+12=16$
$V=(-\frac{2}{2(-1)},-\frac{16}{4(-1)})=(1,4)$