Question

Given the function f(x) =2(x+6)-4for what values of x is f(x)=6

Answer 1

f(x) is another way to say “y” so you could also write, y=2(x+6)-4, and it’s asking what does x equal if y is 6, so you substitute 6 for y.
6=2(x+6)-4
6=2x+12-4
6=2x+8
-2=2x
-1=x