Add `8x^2 +7xy-6y^2 , -4x^2- 3xy+ 2y^2 and -4x^2+ xy-y^2​`

Add (2x^2+5xy+2y^2), (3x^2-2xy+5y^2) and (-2x^2+8xy+3y^2)

Add 4x^2-7xy+6y^2, 4x^2+7xy-6y^2, 4xy-8y^2

Add: 8x^(2) - 5xy - 3y^(2), 2xy - 6y^(2) + 3x^(2) and y^(2) + xy - 6x^(2)

Add 2x^(2)+5xy-2y^(2), 3x^(2)-2xy+5y^(2) and 2x^(2)+8xy+3y^(2)

The sum of x^4 – xy + 2y^2 and -x^4 + xy + 2y^2 is

Add: 4x^(2) - 7xy + 4y^(2) - 3, 5 + 6y^(2) - 8xy + x^(2) and 6 - 2xy + 2x^(2) - 5y^(2)

Subtract the sum of 7x^(2) - 4y^(2) " and " 4x^(2) + 3xy - 4y^(2) from the sum of 5x^(2) - 3xy - y^(2) "and " x^(2) + 2xy - 2y^(2) .

If A = 7x^(2) + 5xy - 9y^(2), B = - 4x^(2) + xy + 5y^(2) and C = 4y^(2) - 3x^(2) - 6xy then show that A + B + C = 0

Add the following expressions: x^3 - x^2y - xy^2 - y^3 and x^3-2x^2y + 3xy^2 + 4y

Add: (i) 3a - 2b + 5c, 2a + 5b - 7c, -a - b + c (ii) 8a - 6ab + 5b, -6a - ab - 8b, -4a + 2ab + 3b (iii) 2x^(3) - 3x^(2) + 7x - 8, -5x^(3) + 2x^(2) - 4x + 1, 3 - 6x + 5x^(2) - x^(3) (iv) 2x^(2) - 8xy + 7y^(2) - 8xy^(2), 2xy^(2) + 6xy - y^(2) + 3x^(2), 4y^(2) - xy - x^(2) + xy^(2) (v) x^(3) + y^(3) - z^(3) + 3xyz, - x^(3) + y^(3) + z^(3) - 6xyz, - x^(3) - y^(3) - z^(3) - 8xyz (vi) 2 + x - x^(2) + 6x^(3). -6 - 2x + 4x^(2) - 3x^(3). 2 + x^(2). 3 - x^(3) + 4x - 2x^(2)