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प्रश्न
Add the following expressions:
p2 – 7pq – q2 and –3p2 – 2pq + 7q2
उत्तर
We have, p2 – 7pq – q2 + (–3p2 – 2pq + 7q2)
= p2 – 7pq – q2 – 3p – 2pq + 7q2
On combining the like terms,
= p2 – 3p2 – 7pq – 2pq – q2 + 7q2
= –2p2 – 9pq + 6q2
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