SOLUTION: add (5m²n+3mn-6mn²) to the difference of (7m²n-2mn²) and (-m²n+9mn²)

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Question 1188645: add (5m²n+3mn-6mn²) to the difference of (7m²n-2mn²) and (-m²n+9mn²)
Answer by MathLover1(20849) About Me  (Show Source):
You can put this solution on YOUR website!

the difference of %287m%5E2n-2mn%5E2%29+and %28-m%5E2n%2B9mn%5E2%29 is

add (5m%5E2n%2B3mn-6mn%5E2) to it
8m%5E2n+-+11mn%5E2%2B5m%5E2n%2B3mn-6mn%5E2
=13m%5E2n+-+17mn%5E2+%2B+3mn
so,