Question

find the value of m^3+n^3-9mn if m+n+3=0 full explaination​

Answer 1

Answer:

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....