20.y(x+y)^(2)-3x-3y+2

LetS={(x,y)|x^(2)+2xy+y^(2)-3x-3y+2=0}, thenS vdots(A) consists of two coincident lines.(B) consists of two parallel lines which are not coincident.(C) consists of two intersecting lines.(D) is a parabola.

(x+y)^(3)-(x-y)^(3) can be factorized as 2y(3x^(2)+y^(2)) (b) 2x(3x^(2)+y^(2))2y(3y^(2)+x^(2)) (d) 2x(x^(2)+3y^(2))

Simplify the following : (x-y)(2y-x)+(x+y)(x-y)-(y-3x)(2x-3y)

Evaluate: (2x+3y)^(2)( ii) (2x-3y)^(2)(2x+3y)2x-3y)

x (x + y) ^ (3) -3x ^ (2) y (x + y)

Solve :(x+y)/(x-y)=(3)/(2),3x-2y=13

Equation of the parabola with focus (0,-3) and the directrix y=3 is: (a) x^(2)=-12y (b) x^(2)=12y (c) x^(2)=3y (d) x^(2)=-3y