Question 3 (10 marks,C3)Leta-312A=7-18-a26a-1(a)Find det(A)by cofactor expansion with respect to the second column.(b)Find all values of a so that A is not invertible.
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Question 3 (10 marks,C3)Leta-312A=7-18-a26a-1(a)Find det(A)by cofactor expansion with respect to the second column.(b)Find all values of a so that A is not invertible.
