Question

2
(i) If the value of the determinant m*2
. 5-7
is
, find the value
5 - 7
of m.​

Answer 1

(m×7) - (-5×2) = 31

7m- (-10)=31

7m + 10 = 31

7m = 31 - 10

7m = 21

m = 21/7

m = 3