Question

Quais as raízes da equação x² + 2x - 8 = 0

Answer 1

Δ=b²-4ac

Δ=4-4.1.(-8)

Δ=4+32

Δ=36

x=-2+√36/2       x=-2+6/2         x=4/2          x=2

x=-2-6/2           x=-8/2            x=-4