If the matrix ■(2&-4@x&9) = 58, find the value of x.

If the matrix ■(2&-4@x&9) = 58, find the value of x.

A. 10
B. 30
C. 14
D. 28

Correct Option: Answer is A

Solution:

= |■(2&-4@x&9)| =58

= (2 x 9) – (-4 x x) = 58
18 + 4x = 58
4x = 40 = 10

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