Calculus question

Question 1

What is the greatest common factor of: 22x⁵y⁷ – 14x³y⁸ + 18x⁶y⁴?

            Factoring a 2 from each term gives:

                        2(11x⁵y⁷ – 7x³y⁸ + 9x⁶y⁴)