Answer:
You plug in the number 3 into both the f(x) and the x of the equation. By solving for x of the equation, you would find f(3).
It'd look something like this:
we know that x = 3
f(x) = whatever the function is (say x^3 + 3x^2 + 5x + 1)
f(3) = 3^3 + 3 * 3^2 + 5 * 3 + 1
= 27 + 9 + 15 + 1
= 52
Hope this helps, and please mark me brainliest if it does!
