Question

Value of the following determinant is 31, then find the value of x 2 2 - 5 7​

Answer 1

Answer:

$\huge \frac{m}{ - 5} \frac{2}{7}$

(m x 7) -(-5x 2) = 31

7m-(-10) 31

7m+ 10 31

7m 21

m = 3

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