Question

as coordenadas do vértice da função f x = - X2 quadrado + 2x + 8 determine​

Answer 1

Resposta:

-x²+2x+8 = 0

∆ = b²-4ac

∆ = 2²-4.(-1).(8)

∆ = 4+32

∆ = 36

xv = -b/2a

xv = -2/2.(-1)

xv = -2/-2

xv = 1

yv = -∆/4a

yv = -36/4.(-1)

yv = -36/-4

yv = 9

(1, 9)