Respuesta :
(x - 4)(x^2 + 5x + 2) =
x(x^2 + 5x + 2) - 4(x^2 + 5x + 2) =
x^3 + 5x^2 + 2x - 4x^2 - 20x - 8 =
x^3 + x^2 - 18x - 8 <==
x(x^2 + 5x + 2) - 4(x^2 + 5x + 2) =
x^3 + 5x^2 + 2x - 4x^2 - 20x - 8 =
x^3 + x^2 - 18x - 8 <==
Distribute
x3 + 5x2 + 2x - 4x2 - 20x - 8
Add or subtract like terms.
x3 + x2 - 18x - 8
x3 + 5x2 + 2x - 4x2 - 20x - 8
Add or subtract like terms.
x3 + x2 - 18x - 8