Question

resolução de x²+5x-2=-8

Answer 1

x² + 5x - 2 = - 8
x² + 5x - 2 + 8 = 0
x² + 5x + 6 = 0
Δ = 5² - 4 * 1 * 6
Δ = 25 - 24
Δ = 1
x = - 5 +- √1 / 2a
x' = - 5 + 1 / 2
x' = - 4 / 2
x' = - 2
x" = - 5 - 1 / 2
x" = - 6 / 2
x" = - 3
S = {-2, - 3 }