**AP Calculus AB Practice Question 1**

### Test Information

**Question: 1**

If f(x) = 5x^{}, then f ′(8) =

**Correct Answer:** B

**Explanation:**

B If f(x) = 5x^{}, then f′′(8) =

We need to use basic differentiation to solve this problem.

Step 1:

Step 2: Now all we have to do is plug in 8 for x and simplify.