Question

calcule a raiz,as coordenadas da vértice e faça o grafico.

 

y=-2x²+8x-6

Answer 1

$-2x^2+8x-6\\\Delta=8^2-4.(-2).(-6)\\\Delta=64-48\\\Delta=16$

$\boxed{Xv= \frac{-b}{2a} ~\to~ \frac{-8}{2.(-2)} ~\to~ \frac{-8}{-4}\to~ ~Xv=2}$

$\boxed{Yv= \frac{-\Delta}{4a} ~\to~ \frac{-(16)}{4.(-2)} ~\to~ \frac{-16}{-8} ~\to~2}$