Mathematics, 14.09.2019 03:30 CoreyHammond1517
Suppose a is a 3 x 3 matrix such that det (a) = 9. prove det (3 (a-! ') is equal to 3
Answers: 1
![det(3A^{-1})~~~~~~~[\textup{since A is of order 3}]\\\\=3^3det(A^{-1})\\\\=27\times\dfrac{1}{9}\\\\=3.](/tpl/images/0230/7513/5cdb9.png)
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Suppose a is a 3 x 3 matrix such that det (a) = 9. prove det (3 (a-! ') is equal to 3...
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