" b) "9(x-2y)^(2)+36(x-2y)(x+y)+36(x+y)^(2)

16(x+y)^(2)-36(x-y)^(2)=

24x ^(3) - 36x ^(2)y

Factorise: 25(x+y)^(2)- 36 (x-2y)^(2).

The locus of the mid-point of the chord of contact of tangents drawn from points lying on the straight line 4x-5y=20 to the circle x^2+y^2=9 is : (A) 20(x^2+y^2)-36+45y=0 (B) 20(x^2+y^2)+36-45y=0 (C) 20(x^2+y^2)-20x+45y=0 (D) 20(x^2+y^2)+20x-45y=0

Factories the following : 12x^(2) + 36x^(2) y + 27y^(2) x^(2)

For all real values of m, the straight line y=mx+sqrt(9m^(2)-4) is a tangent to which of the following certain hyperbolas? (a) 9x^(2)+4y^(2)=36 (b) 4x^(2)+9y^(2)=36 (c) 9x^(2)-4y^(2)=36 (d) 4x^(2)-9y^(2)=36

Image of ellipse 4x^2 + 9y^2 = 36 in the line y=x is : (A) 9x^2 + 4y^2 = 36 (B) 3x^2 + 2y^2 = 36 (C) 2x^2+3y^2 = 36 (D) none of these