(a) Let U D fp 2 P4.F/ W p.6/ D 0g. Find a basis of U.(b) Extend the basis in part (a)

Chapter 2, Problem 4

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QUESTION:

(a) Let \(U=\left\{p \in \mathcal{P}_{4}(\mathbf{F}): p(6)=0\right\}\). Find a basis of \(U\).

(b) Extend the basis in part (a) to a basis of \(\mathcal{P}_{4}(\mathbf{F})\).

(c) Find a subspace W of \(\mathcal{P}_{4}(\mathbf{F})\) such that \(\mathcal{P}_{4}(\mathbf{F})=U \oplus W\).

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QUESTION:

(a) Let \(U=\left\{p \in \mathcal{P}_{4}(\mathbf{F}): p(6)=0\right\}\). Find a basis of \(U\).

(b) Extend the basis in part (a) to a basis of \(\mathcal{P}_{4}(\mathbf{F})\).

(c) Find a subspace W of \(\mathcal{P}_{4}(\mathbf{F})\) such that \(\mathcal{P}_{4}(\mathbf{F})=U \oplus W\).

ANSWER:

Step 1 of 7

a)

Let  be such that . Then, by the result quoted above,  where  .

On the other hand, if , then  and 6 is a root of .

This establishes one-one correspondence between  such that  and the polynomials .

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