Question

Polynomials - Question is attached

Answer 1

Just replace all the x's with 3, you'll get your answer :)

Answer 2

But why does it say a=3? Why not x=3?

Answer 3

you were tasked to find
f(a)
so, you replace all your x's with a's
but your a=3
so you replace your a's in turn, with 3's :)
I skipped a step, but I think you'll find it's simpler that way :)

Answer 4

Ohhh! Okay, I get it. Thanks!