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Question
Add: 4x2y, - 3xy2, - 5xy2, 5x2y
Solution
4x2 y - 3xy2 - 5xy2 + 5x2y = 4x2y + 5x2y - 3xy2 - 5xy2
= x2y (4 + 5) + xy2 (- 3 - 5)
= 9x2y - 8xy2
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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 + `square` (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 + `square` (a – 2)] | Age (Human Years) |
| 2 | ||
| 3 | ||
| 4 | ||
| 5 | ||
| 6 |
