Hello Naveen
We have |A|, we need to find |A-1|
We know that
AA-1 = I
Taking determinant both sides
|A A-1| = |I|
Determinant of Identity Matrix (I) = 1
|A A-1| = 1
|A| |A-1| = 1
|A-1| = 1/|A|
|A-1| = 1/7
Written on Nov. 18, 2017, 11:56 a.m.
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Answer of this question
If A is A invertible matrix of 3x3 and |A|=7 find |A inverse|
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