MHB Prime Ideals in K[X] - Commutative Algebra Exercise 3.22 (ii)

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I am reading R.Y.Sharp's book: "Steps in Commutative Algebra.

In Chapter 3: Prime Ideals and Maximal Ideals, Exercise 3.22 (ii) reads as follows:

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Determine all the prime ideals of the ring K[X],

where K is a field and X is an indeterminate.

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Can someone please help me get started on this problem.

Peter
 
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$K[X]$ is a PID. So any ideal is principal.

If $P = (f(X))$ is prime, what can you say about $f(X)$?
 

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