Question

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​

Answer 1

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