If that's + 49y2, the answer is (9x - 7y)(9x - 7y) or (9x - 7y)2
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If that's + 49y2, the answer is (9x - 7y)(9x - 7y) or (9x - 7y)2
If that's + 18x + 1, the answer is (9x + 1)(9x + 1) or (9x + 1)2
(4x + 7y)(16x2 - 28xy + 49y2)
(9x - 1)(9x - 1)
a proper factor is a factor.