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SOLVED: When is a diagonal matrix invertible? Explain. If a diagonalmatrix is invertible, what is its inverse?

SOLVED: If possible, diagonalize the following matrix A, that is give a diagonal matrix D and a matrix P such that A = PDP^-1 (you don't have to compute P^-1)-2 20 -8

Diagonal, Lower & Upper Triangular of Matrix in R | lower.tri, upper.tri, diag