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Byju's Answer
Standard XII
Mathematics
Triangular Matrix
A matrix A of...
Question
A matrix A of order 3 × 3 has determinant 5. What is the value of |3A|?
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Solution
If
A
=
a
i
j
is
a
square
matrix
of
order
n
and
k
is
a
constant
,
then
kA
=
k
n
A
Here
,
Number
of
rows
=
n
k
is
a
common
factor
from
each
row
of
k
3
A
=
3
3
A
=
27
×
5
=
135
Given
matrix
is
3
×
3
such
that
A
=
5
Thus
,
3
A
=
135
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Similar questions
Q.
A matrix of order 3 × 3 has determinant 2. What is the value of |A (3I)|, where I is the identity matrix of order 3 × 3.
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Q.
Let A be the matrix of order
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[Note : |A| represent determinant value of matrix A.]
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