Given 𝑓(𝑥) = 𝑥 − 5, find 𝑓(2)

Question

3? And what is the easiest way to work this question for the future?

Answer 1

Hi Rachel S.

For a given function such as

f(x) = x - 5

To evaluate a given value of x such as 2 just plug that value into the function wherever there is an x

so f(2) is

f(2) = 2 - 5

Can you complete it from here

Please give it a try.

Answer 2

f(x) = x - 5, find f(2):

Basically substitute x with any value then solve the equation.

f(2) = 2 - 5 = -3

Other examples:

f(x) = x^2, find f(2):

f(2) = 2^2 = 4

f(x) = 2x + 3, find f(5):

f(5) = 2(5) + 3 = 13