Show that if the det(A)=1
Using the following formula A-1=adj(A)/det(A)
if det(A)=1 then A-1=adj(A)
if det(A)=1 then det(A-1)=1
What i'm confused about is
Not sure if this proof is correct, TA explained it rather quickly so im running on pure memory.
I'm not sure about a few things
1.Why can we assume that det(A
2. why can we use the opposite relation to the equation A=adj(A-1)/det(A-1)
That's where I get a bit lost on the logic.