Question

3) Find m if value of determinant m 2 is 31

-5 7​

Answer 1

Answer:

Given, ∣∣∣∣∣∣m−527∣∣∣∣∣∣

⇒7m−(−10)=31

⇒7m+10=31

⇒7m=21

⇒m=3