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Question

Evaluate:
(4pq+3q)2(4pq3q)2

A
48pq2
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B
48p2q
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C
48p2q2
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D
48pq
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Solution

The correct option is A 48pq2
(4pq+3q)2(4pq3q)2
=(4pq)2+2×4pq×3q+(3q)2[(4pq)22×4pq×3q+(3q)2]
[Using identities (a+b)2=a2+2ab+b2 and (ab)62=a622ab+b2]
=16p2q2+24pq2+9q2[16p2q224pq2+9q2] =16p2q2+24pq2+9q216p2q2+24pq29q2
=48pq2

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