Question

o vertice da parabola y=-x+4x+5 é:

Answer 1

$x_{v}= -\frac{b}{2a} \\ \\ x_{v}= \frac{-4}{2(-1)} \\ \\ x_{v}= \frac{-4}{-2} \\ \\ x_{v}=2$



$y_{v}= -\frac{\Delta}{4a} \\ \\ y_{v}= -\frac{4^{2}-4.(-1).5}{4.(-1)} \\ \\ \therefore \\ \\ y_{v}=9$

Vertice (2;9)