find m3+n3-9mn if m+n+3=0
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m+n = -3
or, (m+n)^3 = (-3)^3
or, (m^3 + n^3 + 3mn^2 +3m^2n ) = -27
or, m^3 + n^3 +3mn(m+n) = -27
or, m^3 + n^3 + 3mn(-3) = -27
or, m^3 + n^3 - 9mn = -27
I hope this will help you....
or, (m+n)^3 = (-3)^3
or, (m^3 + n^3 + 3mn^2 +3m^2n ) = -27
or, m^3 + n^3 +3mn(m+n) = -27
or, m^3 + n^3 + 3mn(-3) = -27
or, m^3 + n^3 - 9mn = -27
I hope this will help you....
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