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20-04-2016
Mathematics

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(2a2 + ab + 2b) + (4a2 − 3ab + 9)

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20-04-2016

2a² + ab + 2b + 4a² - 3ab + 9

combine like terms:
2a² + 4a² + ab - 3ab + 2b + 9

6a² - 2ab + 2b + 9

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