Can someone help me with this one problem Please! :)

Add:
(-1/3x^2-1/4x+3/4)+(1/2x^2-1/4x-1/2)

Here is an example:

(x^2 + 3x + 2) + (2x^2 - 7x + 5)

First, group the like terms together.

(x^2 + 3x + 2)
(2x^2 - 7x + 5)

Then add as usual.

3x^2 - 4x + 7

Use the same method for your problem.