16+2a

16 + 2a can be written as:

• 2a + 16 (standard polynomial form)
• 2(a + 8) (factored form)

If you want to evaluate it, substitute a with a value. For example, if a = 3, then 16 + 2a = 22.

If you meant to solve an equation like 16 + 2a = 0, then a = -8.