GCSE Maths Practice: functions

Question 12 of 13

This question practices evaluating linear functions f(x) = 5x at x = 4.

\( \text{If } f(x) = 5x, \text{ find the value of } f(4). \)

Choose one option:

Check multiplication carefully.

Substitute x = 4 and multiply to find the value of f(4).