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27-12-2020
Mathematics

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27-12-2020

Answer:

Step-by-step explanation:

8. 4p^2 - 8q^2 + 3r^2 + 3p^2 + 5q^2 - 10r^2

7p^2 - 3q^2 - 7r^2

9. 2x^3 - 4x^2 + 3x + 6x^2 - 12x + 9

2x^3 + 2x^2 - 9x + 9

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