Question

1) If the value of the determinant is 31,
find the value of m ............... Answer:
The value of mis
| m 2 |
| -5 7 |​

Answer 1

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Answer 2

Answer:

(mx7) -(2x-5)=31

7m+10=31

7m=31-10

7m=21

m=21/7

m=3