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Answer 1

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Answer 2

27.(a+b+c) ³-a³-b³-c³=3(a+b)(b+c)(c+a)
(a+b+c) (a+b+c) (a+b+c) - a³-b³-c³=3a+3b+3b+3c+3c+3a

HOPE THIS HELPS YOU!!!

28. x²+1/x²=3
=x⁴+1/x²=3
=x²=3

HOPE THIS HELPS YOU!!!