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Question
Find the sum of: x2 + x – 2, 2x – 3x2 + 5 and 2x2 – 5x + 7
Solution
x2 + x – 2, 2x – 3x2 + 5 and 2x2 – 5x + 7
= x2 + x – 2 + 2x – 3x2 + 5 + 2x2 – 5x + 7
= x2 - 3x2 + 2x2 + x + 2x - 5x - 2 + 5 + 7
= 3x2 - 3x2 + 3x - 5x - 2 + 12
= 0 - 2x + 10
= - 2x + 10
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Observe the following nutritional chart carefully:
| Food Item (Per Unit = 100g) | Carbohydrates |
| Rajma | 60g |
| Cabbage | 5g |
| Potato | 22g |
| Carrot | 11g |
| Tomato | 4g |
| Apples | 14g |
Write an algebraic expression for the amount of carbohydrates (in grams) for y units of potatoes and 2 units of rajma.
