[b](a + b)[sup]3[/sup] = [color=#ff0000]a[sup]3[/sup][/color] + [color=#0000ff]3a[sup]2[/sup]b[/color] + [color=#6aa84f]3ab[sup]2[/sup][/color] + [color=#f1c232]b[sup]3[/sup][/color][/b]