a²+5a-3a²

A) 5a+2a²

B) 5a-2a2

C) 2a²+5a

D)5a-3a²

-2a² + 5a

To simplify the expression a² + 5a - 3a², we need to add or subtract like terms.

First, let's combine the terms that have the same variable raised to the same power:
a² - 3a² = -2a²

So now the expression becomes -2a² + 5a.

Therefore, the answer is:

D) 5a - 3a²