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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

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tonb
tonb tonb
  • 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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