Question

determine o xv e yv da parabola de y=-x2+2x-1 ajuda urgente

Answer 1

y = x² + 2x -1

Xv = $\frac{-b}{2a}$
Xv = $\frac{-2}{2}$
Xv = -1

Yv = $\frac{-Δ}{4a}$
Δ = (2)² - 4 . 1 . (-1)
Δ = 4 + 4
Δ = 8
Yv = $\frac{-8}{4}$
Yv = $\frac{-8}{4}$
Yv = -2

V(-1,-2)