If x + y = 14, then the value of x^3 + y^3 + 42 xy is :

If x + y = 14

Then the value of $x^3 + y^3 + 42 xy$

Here one equation and two variables are given then we can take one variable according to our choice.

So put y = 0

If x = 14

Then the value of $x^3 $ = $14^3 $ = 2744