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

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

Simplify the following (2x^(2) - 3xy) (4x+5y)

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

Evaluate : 3x^(2) + 5xy - 4y^(2) + x^(2) - 8xy - 5y^(2)

Add the following : 5xy , - 7xy and 3x^(2)

Add the following expressions: x^(2)-2xy+3y^(2), 5y^(2)+3xy-6x^(2)

Factorise : 6x^(2) y + 9xy^(2) + 4y^(3)

Divide : 12x^(2) + 7xy - 12y^(2) by 3x + 4y

Multiply : 3x^(2) y - 7xy^(2) +2xy" by " 4xy

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