Q4. Verify that (11pq +4q)²- (11pq - 4g)²=
176pq²
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Answer:
(11pq+4q)²-(11pq+4q)²=176pq²
Let us consider LHS
(11pq+4q)²-(11pq+4q)²=121p²q²+88pq²+16q²-(121p²q²-88pq²+16q²)
=121p²q²+88pq²+16q²-121p²q²+88pq²-16q²
=176pq²
LHS =RHS
Hence proved
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