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प्रश्न
Add the following expressions:
p2 – 7pq – q2 and –3p2 – 2pq + 7q2
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उत्तर
We have, p2 – 7pq – q2 + (–3p2 – 2pq + 7q2)
= p2 – 7pq – q2 – 3p2 – 2pq + 7q2
On combining the like terms,
= p2 – 3p2 – 7pq – 2pq – q2 + 7q2
= –2p2 – 9pq + 6q2
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संबंधित प्रश्न
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At age of 2 years, a cat or a dog is considered 24 “human” years old. Each year, after age 2 is equivalent to 4 “human” years. Fill in the expression [24 + 
(a – 2)] so that it represents the age of a cat or dog in human years. Also, you need to determine for what ‘a’ stands for. Copy the chart and use your expression to complete it.
| Age | [24 +  (a – 2)] |
Age (Human Years) |
| 2 | ||
| 3 | ||
| 4 | ||
| 5 | ||
| 6 |
