Question

Factor 49x^16 −16y^64

Answer 1

Hello:
 49x^16 −16y^64 = 7²(x^8)² - 4²(y^32)² =(7x^8)² - (4y^32)²
                            =(7x^8 - 4y^32)(7x^8 + 4y^32)
(by identite : a²-b² = (a-b)(a+b))

Answer 2

This was the correct answer, I even provided proof from my own test. Hope this helps!