Question

Let A = [(1  -1  1), (2  1  -3), (1  1  1)] and 10B = [(4  2  2), (-5  0  α), (1  -2  3)]. If B is the inverse of matrix A, then α is equal to

(a) -2 

(b) 1 

(c) 2

(d) 5

Answer 1

Correct option (d) 5

Explanation:

Since, B is the inverse of matrix A, i.e., B = A ^-1

Comments

Can't understand the final step

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Compare the elements of row 2 of both matrices, you will get the last line