Add :
`-1/2 x^(2) , 5x^(2) , -1/3 x^(2)`

Add : 5x^(2) , - 9x^(2)

Add : 1/4 x^(2)y^(2) , 3x^(2)y^(2)

Add : 5x^(3)y, - 2/3 x^(3)y

Add the following expressions: 2x^(2), -5x^(2) - x^(2), 6x^(2)

Find the sum of the following algebraic expressions : 3x^(3) - 5x^(2) + 2x + 1 , 3x - 2x^(3) - x^(3) , 2x^(2) - 7x + 9

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

Add the following algebraic expressions : (i) 5x^(3)- 3x + 7 , 2x^(2) - 11 and 7x^(3) - 11x^(2) + 4x- 3

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

If 2(x^(2)+1)=5x , find : (i) x-(1)/(x) (ii) x^(3)-(1)/(x^(3))

Add 3x^2 and 9x^2