Respostas

2013-12-11T09:50:01-02:00
0 da função:

y=x²-2x-15
x²-2x-15 = 0
DELTA=B²-4AC
DELTA= -2² - 4.1.-15
DELTA=4+60
DELTA=64

-B+-VDELTA / 2A
2-+8/2
x¹=-6/2 = -3
x²=10/2 = 5

vertice da funcao
f(x)=x²-4x-5

Xv= -b/2a =4/2 = 2
Yv= -delta/4a = -36/4 = -9

V(2,-9)