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08-07-2018
Mathematics

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From the sum of 3a²-a-3 and 2a-9,subtract a²-3a-7

Respuesta :

08-07-2018

the sum of 3a²-a-3 and 2a-9 is 3a²+a-12

3a²+a-12 - (a²-3a-7) = 3a²+a-12 - a² + 3a + 7 =

2a² +4a - 5

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