(3a + b)(3a - b)
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There is a formula for the "difference of squares." In this case, the answer is (3A + B)(3A - B)
(3a - 5b)(9a2 + 15ab + 25b2)
9a4-b2=36a-2b=2(18-b) But if you meant 9a^4-b^2 it is not possible to factor
4(16a4 + b2)
The GCF is a2b.