Fill in the blanks:
`3xy^2+4xy-2x^2y+9=3xy^2+9-`_______

Simplify the following : 3xy^(2) - 5x^(2)y + 7xy - 9xy^(2) - 4xy + 6x^(2)y

Factorise : (ii) 3x^2 y - 6xy^2 + 9xy

Simplify the following : 2x^(2) + 3y^(2) - 5xy +5x^(2) - y^(2) + 6xy - 3x^(2)

Factorise : (vii) x^(2) y^(2) - 3xy - 40

The angle of rotation of axes to remove xy term in the equation x^(2) + 4xy + y^(2) - 2x + 2y -6=0 is

Factorise completely : x^2 + 4xy + 4y^2 - 9z^2

Find the transformed equation of 3x^(2)+10xy +3y^(2) = 9 when the axes are rotated through an angle pi/4

Simplify the following : 7xy - 4xy - 3xy - 11 xy + 5xy - xy

Add the following expressions using horizontal method : -x^(2)y + xy^(2) + 2xy , 3x^(2) y + 4xy^(2) + 5xy and 7x^(2)y - 10xy^(2) - xy

Simplify : 7x^3 +8y^3- (4x+3y)(16x^2-12xy+9y^2)