simplify the given polynomial
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Just apply (a-b) 3
In second one u r supposed to do something the same as well
In second one u r supposed to do something the same as well
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bhak
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1.7x³+8y³-(4x+3y)(16x²-12xy+9y²)
=7x³+8y³-(64x³-48xy+36xy²+48xy-36xy²+27y³)
=7x+8y³-64x³-27y³
=-57x³-19y³
=57x³+19y³
2. (a+b)³+(a-b)³+6a(a²-b²)
=a³+b³+3a²b+3ab²+a³-3a²b+3ab²+b³+6a³-6ab²
cancelling out 3a²b and - 3a²b we get,
8a³+6ab²+2b³+6ab²
cancelling out 6²ab and - 6a²b
taking 2 common out ,
2(4a³)+b³
hope it helps... )
=7x³+8y³-(64x³-48xy+36xy²+48xy-36xy²+27y³)
=7x+8y³-64x³-27y³
=-57x³-19y³
=57x³+19y³
2. (a+b)³+(a-b)³+6a(a²-b²)
=a³+b³+3a²b+3ab²+a³-3a²b+3ab²+b³+6a³-6ab²
cancelling out 3a²b and - 3a²b we get,
8a³+6ab²+2b³+6ab²
cancelling out 6²ab and - 6a²b
taking 2 common out ,
2(4a³)+b³
hope it helps... )
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