Find a basis B for the domain of T such that the matix of T relative to B is diagonal.

given..

T: P1 -> P1

T(a + bx) = a + (a + 2b)x

I got confused with this hw problem. Thank you.

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- May 18th 2007, 05:01 AMtest2k6Eigenvalues and Eigenvectors
Find a basis B for the domain of T such that the matix of T relative to B is diagonal.

given..

T: P1 -> P1

T(a + bx) = a + (a + 2b)x

I got confused with this hw problem. Thank you. - Jun 16th 2007, 03:48 PMRebesques
Identify the polynomial with the vector (transposed, can't bother texing marices :o ). Then T acts like multiplication by the matrix .

How to diagonalize this? Solve for to get the eigenvalues 1 and 2. The corresponding eigenspaces come from and . Gladly, each space has one unit eigenvector, and they are orthogonal by theory. Arrange these in a matrix P, and you are done.