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Anonymous
If by "What is the answer to", you mean "How do you factor", then we can solve it as follows:
x2 + 13xy + 36y2
= x2 + 4xy + 9xy + 36y2
= x(x + 4y) + 9y(x + 4y)
= (x + 9y)(x + 4y)
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x2 + x2 = 2x2
x4 +x2 =x2 (x2+1)
4x2 + x2 = 8 + x2
x3 + x2 + 4x + 4 = (x2 + 4)(x + 1)