If `(x-y)^(2)=50 and xy=7`, what is the value of `x^(2)+y^(2)`?

If x-y=7 and xy=9, find the value of x^(2)+y^(2)

If 2x-3y=5 , what is the value of 4x^(2)-12xy+9y^(2) ?

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

If x-y=9 and xy=16 then the value of x^(2)+y^(2)

If ((5x-y))/((5x + y)) =3/7, what is the value of ((4x ^(2) + y ^(2) -4 xy ))/( ( 9x ^(2) + 16 y^(2) + 24 xy)) ?

If 3x-7y=10 and xy=-1, find the value of 9x^(2)+49y^(2)

If x-y=7 and xy=9, then find the value of (x^2+y^2)

If log_((x-y))(x+y)=5 , then what is the value of log_(x^(2)-y^(2))(x^(2)-2xy + y^(2))?