Question

Calculando-se o vertice da parabola -4x²+4x+5 obtem-se?

Answer 1

Vx= -b/2a
Vx= -4/2.(-4)
Vx= -4/-8
Vx= 1/2

Vy= f(x) = -4x^2 + 4x + 5
Vy= f(1/2) = -4.(1/2)^2 + 4.(1/2) +5
Vy= -4 (0,25) + 2 +5
Vy= -1 +7
Vy= 6

Portanto, V= (1/2,6)