Question

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

A. 3a + 1
B. a + 2
C. 3a + 4

Answer 1

the answer is

3a + 4

Answer 2

Given the function f(x) = 3x + 1, evaluation of f(a + 1) gives:

C. 3a + 4

Explanation:

Given function:

f(x) = 3x + 1

We have to find f(a+1).

For this purpose, we will take x = a+1 and

substitute it in the function f(x) = 3x+1:

f(x) = 3x + 1

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

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

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

f(a+1) = 3a + 4

So the function f(a+1) is equal to option C. 3a + 4.