Question

(2x-1).(2x+6)base x altura dividido por 2.função quadratica

Answer 1

[(2x-1).(2x+6)]/2 = [4x² + 12x - 2x - 6]/2 = (4x² + 10x - 6)/2 = 2x² + 5x - 3

Resolvendo:

2x² + 5x - 3 = 0

Δ = 25 - 4.2.(-3) = 25 + 24 = 49

x' = -5 + √49/2.2 = -5 + 7/4 = 2/4 = 1/2

x" = -5 - √49/2.2 = -5 - 7/4 = -12/4 = -3