If `x^(2) - y^(2) = 28` and x + y = 7 then `(x - y)^(2) = "_________"` .

If x -y = 13 and xy = 28, then find x ^(2) + y ^(2).

If x^2+y^2=7 and xy=2 then x^4-2x^2y^2+y^4=

If (x+y)^(2)-(x-y)^(2)=28 , what is the value of xy?

If 2x-y = 7 and x-y = 6, then value of x and y will be

If (x ^(2))/( y ^(2)) + (y ^(2))/( x ^(2)) = 7, then the vlaue of (x ^(3))/( y ^(3)) + (y ^(3))/(x ^(3)) is