What is the correct formula for the value of the determinant?
la bl
|c d|

Explanation:

Given

Required

Determine the determinant

Represent the determinant with D

Since the above matrices is 2 by 2.

All we have to do is to multiply the alternate elements of the columns

i.e. (a * d) and (b * c)

Then subtract:

Simplify

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the answer was wrong so you should have checked with your pals first