Question

Given the function f(c)=4|x-5|+3, for what values of x is f(x)=15?

Answer 1

All you have to do is plug in 15 to f(x) to get

15=4|x-5|+3 then solve for x
12=4|x-5|
3=|x-5|

3=x-5
-3=x-5

x=8, -2

Hope this helped :)