Question

Qual o resultado de X²-X-12=0?

Answer 1

x² - x - 12 = 0

Δ = b² -4ac
Δ = (-1)² - 4*1*(-12)
Δ = 49

x = (-b +- √Δ) / (2a)
x = (1 +- √49) / 2

x' = (1 + 7) / 2
x' = 8/2 = 4

x" = (1 - 7) / 2
x" = -6/2 = -3