3x2+5x-5x2-4x+5-2

-5x^2 + 3x^2 = -2x^2

5x - 4x = x
5 -2 = 3

-2x^2+x+3

To simplify the expression 3x^2 + 5x - 5x^2 - 4x + 5 - 2, we can combine like terms.

First, let's group the terms with the same variables. We have:
(3x^2 - 5x^2) + (5x - 4x) + (5 - 2)

Simplifying each group, we get:
-2x^2 + x + 3

Therefore, the simplified expression is -2x^2 + x + 3.