Answer:
8a
They are both equal to 16
Step-by-step explanation:
The initial expression is:
3a + 5a
Since both term have the variable a, we can add them as
(3 + 5)a = 8a
So, the equivalent term is 8a.
Then, to verify that they are equivalen, we will replace a by 2 on both expression, so
3a + 5a
3(2) + 5(2)
6 + 10
16
8a
8(2)
16
Therefore, both expressions are equal to 16.
So, the answers are
8a
They are both equal to 16