If x²+y²+z² = xy + yz + zx, then the value of is

If a=x+y, b=x-y, c=x+2y, then is

Solve the following equation.

If then the value of is

If   and  where a, b, c are all non – zero numbers, then x equals to

Simplification 

If then the value of

If average of two x and (where x ≠ 0) is A, what will be the average of x³ and ?