Question

resolvas a equação x(x+8) = 4x-5

Answer 1

x(x + 8) = 4x - 5
x² + 8x = 4x - 5
x² + 8x - 4x = -5
x² + 4x + 5 = 0
_________________
b² - 4•a•c
∆ = 4² - 4•1•5
∆ = 16 - 20
∆ = -4
S = {0}