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AP EAMCET Engineering 2016 Code C Paper
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© examsnet.com
Question : 6
Total: 160
If
|
−
a
|
=
3
,
|
−
b
|
=
4
and the angle between
−
a
&
−
b
is 120° then
|
4
−
a
+
3
−
b
|
is equal to
25
7
13
12
Validate
Solution:
|
4
−
a
+
3
−
b
|
2
=
16
|
a
2
|
+
9
|
b
2
|
+
24
|
a
|
|
b
|
c
o
s
(
120
°
)
=
144
+
144
+
24.3
,
4
−
1
2
=
144
+
144
−
144
=
144
|
4
−
a
+
4
−
b
|
=
12
© examsnet.com
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