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Math Help - [SOLVED] why am i not getting the same answer?

  1. #1
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    [SOLVED] why am i not getting the same answer?

    hi this is part of a question I was doing which wasn't really difficult, but i had a question about a section where I didn't get the same part using 2 methods...

    I have to show: m-n = (p-q)^3

    and the equations are: 2p^3 - 3(p+q)p + 6qp^2 = m

    and 2q^3 - 3pq - 3q^2 + 6pq^2 = n

    so if u simply subtract the 2 equations, you get the answer.. but i don't get it when i form 2 equations with:

    -3pq= ..... for both, and then equating their left sides

    any suggestions?
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  2. #2
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    i just realised i made a silly mistake way earlier on sorry!
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