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EAMCET Engineering 2005 Solved Paper
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© examsnet.com
Question : 98
Total: 160
If
m
[
−
3
,
4
]
+
n
[
4
−
3
]
=
[
10
−
11
]
,
then
3
m
+
7
n
is equal to
3
5
10
1
Validate
Solution:
Given that,
m
[
−
3
4
]
+
n
[
4
−
3
]
=
[
10
−
11
]
⇒
[
−
3
m
+
4
n
4
m
−
3
n
]
=
[
10
−
11
]
⇒
−
3
m
+
4
n
=
10
. . . (i)
and
4
m
−
3
n
=
−
11
. . . (ii)
On solving equations (i) and (ii), we get
n
=
1
,
m
=
−
2
Now,
3
m
+
7
n
=
3
(
−
2
)
+
7
(
1
)
=
1
© examsnet.com
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