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(y + 3)(y - 10)
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y4 - 256 = (y2 - 16)(y2 + 16) = (y - 4)(y + 4)(y2 + 16)
x2-y2=(x-y)(x+y) which is a well known identity.
If that's y2, the answer is (y - 5)(y + 3)
9y-81=9*(y-9)
0.5(x - y)(2x + 2y - 3)