Answers

2015-07-14T00:31:49+08:00
(x³n+4xn)(x³-4xn+4)
=x³n(x³-4xn+4)+4xn(x³-4xn+4)
=x^6-4x⁴n²+4x³n+4x⁴n-16x²n²+ 16xn
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