(x+y)²+64(x-y)²-16(x²-y²) factorise
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(x+y)²+64(x-y)²-16(x²-y²)
x2 + y2 + 2xy + 64x2 + 64y2 - 128xy - 16x2 - 16y2 + 32xy
49x2 + 49 y2 -94xy is the answer
you can factorise it more
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