Răspuns:
x^5 - 16x = x × (x^4 - 16) =
x × (x^4 - 2^4) =
x × (x² - 4)(x² + 4) =
x × (x - 2)(x + 2)(x² + 4)
e)
x^2 + x - 2 =
x^2 + 2x - x - 2 =
x(x + 2) - (x + 2) =
(x + 2)(x - 1)
f)
x^2 + x - 6 =
x^2 + 3x - 2x - 6 =
x(x + 3) - 2(x + 3) =
(x + 3)(x - 2)
g)
x^2 + 2x - 8 =
x^2 + 4x - 2x - 8 =
x(x + 4) - 2(x + 4) =
(x + 4)(x - 2)