Question

if f(x)=20, what does x equal?

Answer 1

Answer:

20

Step-by-step explanation:

$X=20$ because f (20) would also be 20. Since we don't know the value behind 20, we would suppose x is the value. The original equation is now $f(x)=x$. If we do $f(20)=x$ we would get that (since x is being substituted) $f(20)=20$.