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02-12-2016
Mathematics

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(3a2 + 2a - 2) - (a2 - 3a + 7)

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02-12-2016

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simlify 2nd part
-(a^2-3a+7)=-1(a^2-3a+7)=-a^2+3a-7

now we have
3a^2+2a-2-a^2+3a-7=
3a^2-a^2+2a+3a-2-7=
2a^2+5a-9

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