Students arrived for school in groups. bill was the first to arrive. consider him the first group. each group that arrived after bill had two more people than the group that arrived before it. how many people were in school after 20 groups arrived?

To diagonalize an nxn matrix a means to find an invertible matrix p and a diagonal matrix d such that a pdp d p ap or [1 3 dh epap 3 let a=-3 -5 -3 3 3 1 step 1: find the eigenvalues of matrix a "2's" step 2: find the corresponding eigenvectors of a step 3: createp from eigenvectors in step 2 step 4 create d with matching eigenvalues.