Question

determine as coordenadas do vertice das parabolas referentes as funções dadas. a) h(x)= -x²-2x+8
b)j(x)=x²+2x-3

Answer 1

a) -x^2-2x+8=0
delta=b^2-4ac
delta=(-2)^2-4.(-1).8
delta=4+32
delta=36
xv=-b/2a
xv=-(-2)/2.(-1)
xv=2/-2
xv=-1
yv=-delta/4a
yv=-36/4.(-1)
yv=-36/-4
yv=9
(-1, 9)
b) x^2+2x-3=0
delta=b^2-4ac
delta=2^2-4.1.(-3)
delta=4+12
delta=16
xv=-b/2a
xv=-2/2.1
xv=-2/2
xv=-1
yv=-delta/4a
yv=-16/4.1
yv=-16/4
yv=-4
(-1, -4)