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captainjack2000
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1. The proof that det(kA) = k^ndetA where A is nxn
I read somewhere that det(rI(n)) = r^(n)
so det(rA) = det(rI(n).A) = r^ndetA but I am really confused about how they got that? Is I the identity matrix? What would the det(I) be?
I read somewhere that det(rI(n)) = r^(n)
so det(rA) = det(rI(n).A) = r^ndetA but I am really confused about how they got that? Is I the identity matrix? What would the det(I) be?