Answer:
-42
Step-by-step explanation:
Cross multiply
5 * -2 = -10
8 * 4 = 32
-10 - 32 = -42
Answer:
A. [tex]-42[/tex]
Step-by-step explanation:
We have been given a 2 by 2 matrix. We are asked to find the discriminant for our given matrix.
The discriminant for our given matrix would be product of negative 2 and 5 minus product of 4 and 8.
[tex]\text{Discriminant}=5\times -2-4\times 8[/tex]
[tex]\text{Discriminant}=-10-32[/tex]
[tex]\text{Discriminant}=-42[/tex]
Therefore, the discriminant for our given matrix is [tex]-42[/tex] and option A is the correct choice.
