Question

.If the value of the determinant m*7-2*(-5) is 31,find m

2 points

(a)3

(b)4

(c)-3

(d)-4
please answer asap
ill mark you as brainliest
​

Answer 1

Answer:

heya mate ☺

$m \times 7 - 2 \times ( - 5) = 31 \\ \\ = > 7m - ( - 10) = 31 \\ \\ = > 7m + 10 = 31 \\ \\ = > 7m = 31 - 10 \\ \\ = > 7m = 21 \\ \\ = > m = \frac{21}{7} \\ \\ = > m = 3$

So mate option (a) 3 is correct.

hope it helps u mate ⛄

Answer 2

Answer:

$ello$

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

=> 7m - (-10) = 31

=> 7m + 10 = 31

=> 7m = 31 - 10

=> 7m = 21

=> m = 21 / 7

=> m = 3

hope it helps u mate ✌

☞ Thanks for asking ☜