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Question

Evaluate (6p+13qr)2

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Solution

Evaluate (6p+13qr)2={(6p)+13q+(r)2}2
Using, (a+b+c)2=a2+b2+c2+2ab+2bc+2ac
=(6p)2+(13q)2+(r)2+2(6p)(13q)+2(13q)(r)+2(r)(6p)
=36p2+19q2+r24pq23qr+12rp

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