Given the function f (x) = 3x + 1, evaluate f (a + 1). 3 a + 2 3 a + 4 3 a + 1

f (a + 1) = 3a + 4

Step-by-step explanation:

Given the function is:

f (x) = 3x + 1

To determine f (a + 1) we have to substitute (a + 1) in place of 'x'.

Therefore, we have:

f (a + 1) = 3 (a + 1) + 1

= 3a + 3 + 1

= 3a + 4

['a' could be any real number.]

So, f (a + 1) = 3a + 4 is the answer.