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

If x^(4) + y^(4)=19 and x+y=1 find x^(2)y^(2)-2xy

If x^(2) - xy + y^(2) =2 and x^(4) + x^(2)y^(2) + y^(4) = 6 , then the value of (x^(2) + xy + y^(2) is :

If x^(2)+y^(2)=29 and xy=2, find the value of x+y( ii) x-y (iii) x^(4)+y^(4)

Add 5x^2 + 3xy + 2y^2 and 2y^2 - xy + 4x^2 .

If x=2,y=1 then x^(4)+2x^(3)y-2xy^(3)-y^(4) is equal to

If 4x - 3y = 7xy and 3x + 2y = 18xy , then (x,y) =

If x^4+x^2y^2+y^4=21 and x^2+xy+y^2= 7 , then the value of (1/x^2+1/y^2) is : यदि x^4+x^2y^2+y^4=21 तथा x^2+xy+y^2= 7 है, तो (1/x^2+1/y^2) का मान होगा :