Question

Given the function f ( x ) = 3 x − 1 , find x when f(x) = 20. Show the work that leads to your answer.

Answer 1

`20 = 3x - 1 \\ 20 + 1 = 3x \\ 21 = 3x \\ x = 7`

Explanation:

first add the one with 20 then divide by 3