" 5."2(x-y)^(2)-(x-y)-21

(14)/(x+y)+(3)/(x-y)=5,(21)/(x+y)-(2)/(x-y)=1

x"@"y=(x+y)^(2) x#y=(x-y)^(2) Find the value of (9#7)"@"(21#5):

Solve the following simultaneous equations: 14/(x+y)+3/(x-y)=5,21/(x+y)-2/(x-y)=1

Multiply : 3 - (2)/(3)xy + (5)/(7)xy^(2) - (16)/(21)x^(2)y by -21 x^(2)y^(2)

(3,-4) is the point to which the origin is shifted and the transformed equation is X^(2)+Y^(2)=4 then the original equation is (A) x^(2)+y^(2)+6x+8y+21=0 (B) x^(2)+y^(2)+6x+8y-21,=0 (C) x^(2)+y^(2)-6x+8y+21=0 (D) x^(2)+y^(2)-6x-8y+21=0

If (2,3) is an extremity of a diameter of the circle x^(2)+y^(2)-5x-8y+21=0 , then the other extremity of the diameter is

If (2,3) is an extremity of a diameter of the circle x^(2)+y^(2)-5x-8y+21=0 , then the other extremity of the diameter is

If a,b,c gt 0 and x,y,z , in R then the determinant : |((a^x+a^(-x))^2,(a^(x)-a^(-x))^2,1),((b^y+a^(-y))^2,(b^(y)-b^(-y))^2,1),((c^z+c^(-z))^2,(c^(z)-c^(-z))^2,1)| is equal to :