Respuesta :

(-5x - 1)(2x + 8)
-10x^2 - 40x - 2x - 8 = 0
-10x^2 - 42x - 8 = 0
10x^2 + 42x + 8 = 0
5x^2 + 21x + 4 = 0

Quadratic Equation yields:
x = -1/5 and x = -4