Resposta:
Olá bom dia!
x² + 4 x - 8 = 0
Coeficientes:
a = 1 ; b = 4 ; c = -8
Δ = b² - 4ac
Δ = 4² - 4(1)(-8)
Δ = 16 + 32
Δ = 48
√Δ = √48 =√16.(3) = 4√3
x = (-b ± √Δ) : 2a
x = (-4 ± 4√3) : 2
x' = -2 +2√3
x'' = -2 -2√3
