find det (-2A) if A is a 3×3 matrix and det(A)= -1 ?
A. 8
B. 15
C. 20
D. 24
with complete solution
Answers
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0
Answer:
8
Step-by-step explanation:
since A is 3×3 matrix and |A|=-1
therefore, |-2A|=(-2)³|A|=-8*-1=8
Note: A is a 3×3 matrix thus -2 is common from each row.
Hope you have got it
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