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Byju's Answer
Standard X
Mathematics
Multiplication of Matrices
If A and B ar...
Question
If A and B are square matrices of order 3 and |A| = 5, |B| = 5, then |3AB| = ____________.
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Solution
Given:
A and B are square matrices of order 3
|A| = 5
|B| = 5
Now
,
3
A
B
=
3
A
B
∵
A
B
=
A
B
,
if
they
are
square
matrices
of
same
order
=
3
A
×
5
∵
B
=
5
=
3
3
A
×
5
∵
Order
of
A
is
3
×
3
=
135
A
=
135
×
5
∵
A
=
5
=
675
Hence, |3AB| =
675
.
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