I don't understand this:
Let f(x) be a polynomial function of degree k+1, then f(x) has the form
ak+1xk+1 + ... + a1x + a0
Now the polynomial function has degree h(x) = f(x) - ak+1(x-a) has degree <= k
The Attempt at a Solution
I can understand if (x-a) = xk+1 then the k+1 th term will be gone. But what does (x-a) do?