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NDA Math Vector Algebra
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© examsnet.com
Question : 41
Total: 101
If
|
→
a
|
=
3
,
|
→
b
|
=
4
and
|
→
a
−
→
b
|
=
5
,then what is the value of
|
→
a
+
→
b
|
?
[NDA II 2018]
8
6
5
√
2
5
Validate
Solution:
|
→
a
+
→
b
|
2
+
|
→
a
−
→
b
|
2
=
2
{
|
→
a
|
2
+
|
→
b
|
2
}
=
2
×
25
=
50
⇒
|
→
a
+
→
b
|
2
+
25
=
50
⇒
|
→
a
+
→
b
|
2
=
25
⇒
|
→
a
+
→
b
|
2
=
5
© examsnet.com
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