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Answer on Linear Algebra Question for irebami

Question #41339
Compute the determinant of :
∣1 4∣

a. 5
b. -5
c. 4
d. -4

Expert's answer
The determinant of the matrix 2\times 2 can be found using the rule
| a b |
| c d | = ad-bc.
Therefore we have
∣−2 −3∣
∣1 4∣=-8+3=-5
Answer: b.

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