given the function rule f(x)=x^2-4x+3, what is the output of f(-3)

Answer 1

I do not remember exactly what to do, but I think you should try to substitute x with -3. This is because
f(-3) is the same as f(x), except that x is already provided.

Answer 2

(-3)^2 -4(-3) + 3

9 + 12 + 3

24