a ^ 2 +a a^ 3 - a ^ 7 4c ^ 2 -12c^ 4 6) x^ 3 - x ^ 2 x^ 3 - x ^ 2 3m ^ 2 +9m^ 3 5x ^ 5 -15x^ 3

a ^ 2 + a = a * (a + 1)

a ^ 3 - a ^ 7 = a * (a ^ 2 - a ^ 6)

4c ^ 2 - 12c ^ 4 = 4c ^ 2 * (1 - 3c ^ 2)

x ^ 3 - x ^ 2 = x ^ 2 * (x - 1)

3m ^ 2 + 9m ^ 3 = m ^ 2 * (3 + 9m)

5x ^ 5 - 15x ^ 3 = 5x ^ 3 * (x ^ 2 - 3)

Please let me know if there's anything else I can help you with.