Perform Operated Indicated

Mathematics
Tutor: None Selected Time limit: 1 Day

(15a^3 - 15a^2) - (-12a^3 + 20a^2)      (My answer is 27a^3 - 35a^2) 

Please tell me if I'm correct, and if not, what is the correct answer.  Thank you.

May 5th, 2015

Yes, your answer is correct.


May 5th, 2015

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