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Byju's Answer
Standard XII
Mathematics
Multiplication of Matrices
If [ 2 3; 4...
Question
If
(
2
3
4
1
)
×
(
5
−
2
−
3
1
)
=
(
1
−
1
17
λ
)
then what is
λ
equal to?
A
7
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B
−
7
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C
9
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D
−
9
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Solution
The correct option is
B
−
7
GIven,
(
2
3
4
1
)
×
(
5
−
2
−
3
1
)
=
(
1
−
1
17
λ
)
Now,
(
2
3
4
1
)
×
(
5
−
2
−
3
1
)
=
(
10
−
9
−
4
+
3
20
−
3
−
8
+
1
)
=
(
1
−
1
17
−
7
)
So comparing both, we get
λ
=
−
7
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0
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If
a
=
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√
5
−
√
3
,
b
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√
7
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