00:01
So for this question we are given a vector space v and we're given a subset w which is the set of all polynomials where p of 0 equals 0 and we want to determine whether or not w is a subspace.
00:17
If it is we want to provide justification, if not we want to explain why.
00:23
So there are three conditions that are necessary in order to be a subspace.
00:28
First of all the zero polynomial, i'll call it the zero vector, but the zero polynomial needs to be in the subspace.
00:40
Is this true? well yes because the zero polynomial is zero everywhere so p of 0 will equal 0.
00:48
So this condition is certainly met.
00:52
Okay the next condition is closed under vector addition.
00:57
So that means let's take p and q in w.
01:04
Is it going to be true that p plus q is in w? well if p and q are both in w then we know that p of 0 equals 0 and q of 0 equals 0.
01:25
Using properties of functions i can write the following result.
01:32
Whoops.
01:34
P of 0 plus q of 0...