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1. (2x2 + y)(2x2 - y)
2. 4(2x2 + y)(2x2 - y)
3. (x + 4y)(x - 4y)
4. 4(x + 4y)(x - 4y)
5. prime
a. Factor 4x4 - y2
b. Factor 4x2 - 64y2
c. Factor x2 - 16y2
d. Factor 16x4 - 4y2
e. Factor 9x2 - 8y2