Question

if f(x)= -3, what is x?

Answer 1

you have to plug in a number for x

Answer 2

then you can get multiple answers

Answer 3

x is any number

Answer 4

yes

Answer 5

If you graph f(x) = -3, you will get this graph:

So no matter the value of x, f(x) is -3.

X can be anything.

Answer 6

hmm were you given anything else for the problem?
I bet you were given something like Let f(x)=3x+4
if f(x)=-3, what is x?
so you replace f(x) with 3x+4
3x+4=-3 <--then you solve for x
3x=-7
x=-7/3
so f(x)=-3 when x=-7/3