8x-5x²-3

To simplify the expression 8x - 5x² - 3, you need to combine like terms. The like terms in this expression are the x terms.

First, let's combine the x terms:

8x - 5x² - 3

Combining the x terms, we get:

(8x) - (5x²) - 3

Now, let's simplify further by reordering the terms:

-5x² + 8x - 3

So, the simplified expression is -5x² + 8x - 3.