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AP EAPCET 23-Aug-2021 Shift 1 Paper
Show Para
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Section:
Mathematics
© examsiri.com
Question :
30 of 160
Marks:
+1
,
-0
If
35
^
i
+
14
^
j
−
77
^
k
,
2
^
i
+
7
^
j
+
5
^
k
and
5
^
i
+
2
^
j
+
λ
^
k
are coplanar, then
λ
=
11
-11
-10
10
Validate
Solution:
Given,
35
^
i
+
14
^
j
−
77
^
k
,
2
^
i
+
7
^
j
+
5
^
k
and
5
^
i
+
2
^
j
+
λ
^
k
are coplanar, then
|
35
14
−
77
2
7
5
5
2
λ
|
=
0
35
(
7
λ
−
10
)
−
14
(
2
λ
−
25
)
−
77
(
4
−
35
)
=
0
⇒
203
λ
+
2233
=
0
⇒
203
(
λ
+
11
)
=
0
⇒
λ
=
−
11
© examsiri.com
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