Question 16742
Factor:

{{{(x^3 + 3x^2) - (25x + 75)}}} Factor by grouping.
{{{x^2(x + 3) - 25(x + 3)}}} Factor the (x + 3)
{{{(x + 3)(x^2 - 25)}}} Factor the difference of two squares (x^2 - 25)
{{{(x + 3)(x + 5)(x - 5)}}} Done!