Add: (i) `x y^2+4x^2y-7x^2y-3x y^2+3\ a n d\ x^(2y)+x y^2` (ii) `5x^2+7y-6z^2,\ 4y+3x^2,9x^2+2z^2-9y\ a n d\ 2y-2x^2`

Add the following expressions: 5x^(2) + 7y - 6z^(2) , 4y + 3x^(2), 9x^(2) + 2z^(2) - 9y and 2y - 2x^(2)

Add the following: 3x+2y\ a n d\ x+y (ii) x+y+3\ a n d\ 3x+2y+5 2x+3y+z\ a n d\ 2x-y-z

Add : x y ^(2) z ^(2)+ 3x ^(2) y ^(2) z - 4x ^(2)yz ^(2), - 9x ^(2) y ^(2) z + 3x y ^(2) z ^(2) + x ^(2) yz ^(2)

Add x^2+2x y+y^2 to the sum of x^2-3y^2 and 2x^2-y^2+9.

Add : 5x ^(2) - 3xy + 4y ^(2) - 9, 7y ^(2)+ 5xy - 2x ^(2) + 13

Add: 5x - 8y + 2z, 3z - 4y - 2x, 6y - z - x and 3x - 2z - 3y

If P=7x^2+5x y-9y^2,\ Q=4y^2-3x^2-6x y and R=-4x^2+x y+5y^2, show that P+Q+R=0.

{:("Column" A ,, "Column" B), ((3x^(2) - 5)- (2x^(2) - 5 + y^(2)) ,, (a) x^(2) + xy + y^(2)) , (9x^(2) - 16y^(2) ,, (b) 2) , ((x^(3) - y^(3))/(x-y) ,, (c) (9x + 16y) (9x - 16y)) , ("The degree of " (x + 2) (x+3) ,, (d) x^(2) - y^(2)) , (,, (e) 1) , (,, (f) (3x + 4y) (3x - 4y)):}

Add: (i) 3x, 7x (ii) 7y, -9y (iii) 2xy, 5xy, -xy (iv) 3x, 2y (v) 2x^(2), -3x^(2), 7x^(2) (vi) 7xyz, -5xyz, 9xyz, - 8xyz (vii) 6a^(3) , - 4a^(3), 10 a^(3), - 8a^(3) (viii) x^(2) - a^(2), -5x^(2) + 2a^(2), -4x^(2) + 4a^(2)