Question

As coordenadas do vértice da função y=x²-8x+6

a) (-1,4) b) (4,-10)

c) (1,0) d) (0,1) e) (-1,1)

Answer 1

x²-8x+6=0
Δ=b²-4*a*c
Δ=64-4*1*6
Δ=64-24
Δ=40

x=-b+-√Δ/2*a
x=8+-√40/2
x=8+-√2²*2*5
x=8+-2√2*5
x=2(4+-√10)/2
x=4+√10/2
x=4-√10/2

x=2-√10
x=2+√10