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3. (3x + 4) + (5x + 7) =
4. (4n2 + 6n - 5) + (-4n2-n-1)= -
5. (-5y - 3) + (9y +13) =
6. (12x + 6)-(7x + 1) =
7. (-4x + 6)-(-x-1) =
8. (3x2 + 8x - 4) - (x2 - 7x + 2) =
9. (3n2-5+7)-(-2n2 - 3n + 4) =
10. (-3a +9) -(-5a - 6) =​

Sagot :

Answer:

3. (3x + 4) + (5x + 7) = 8x + 11

4. (4n2 + 6n - 5) + (-4n2-n-1) = 5n - 6

5. (-5y - 3) + (9y +13) = 4y + 10

6. (12x + 6)-(7x + 1) = (12x + 6) + (-7x - 1) = 5x + 5

7. (-4x + 6)-(-x-1) = (-4x + 6) + (x + 1) = -3x + 7

8. (3x2 + 8x - 4) - (x2 - 7x + 2) = (3x² + 8x - 4) + (-x² + 7x - 2) = 2x² + 15x - 6

9. (3n2 - 5n+7)-(-2n2 - 3n + 4) = (3n²- 5n + 7) + (2n² + 3n - 4) = 5n² - 2n + 3

10. (-3a +9) -(-5a - 6) = (-3a +9) + (5a + 6) = 2a + 15

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