Question

o valor minimo da função f(x) x²-2x -3 será:
A)-2 B)-4 C)-6 D)-3

Answer 1

x² -2x -3 = 0

Δ = -2² -4 . -3
Δ = 16

x = 2 ± 4/2

x' = 3
x'' = -1

Yv = -Δ/4a
Yv = -16/4
Yv = -4

b) -4