# What Is The Value of The Equation ?

If m + n = -2 then the value of m^{3} + n^{3} -6 mn is

- 8
- 4
- -8
- -4

**Answer: (3) – 8**** Explanation:-**

m + n = – 2

Cubes of both side,

(m + n)^{3} = (- 2)^{3}**Formula-**** (a + b) ^{3} = a^{3} + b^{3} + 3ab(a + b)**

^{}m

^{3}+ n

^{3}+ 3 x mn(m+ n) = (-2) x (-2) x (-2)

m

^{3}+ n

^{3}+ 3 mn(- 2) = – 8

m

^{3}+ n

^{3}– 6 mn = – 8

Hence, the answer is (3) -8