Question

4x 2 + 12 × + 5 = 0 resposta correta matemática 1 anos

Answer 1

Δ = 144 - 80
Δ = 64

x = -12 +-√64/8
x = -12 +-8/8

x' = -12 + 8/8
x' = - 4/8 = -1/2

x'' = -12-8/8
x'' = -20/8 = -5/2                  ok