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KEAM 2015 Math Paper

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Question : 93 of 120
 
Marks: +1, -0
If
→
a
=λ
⋀
i
+2
⋀
j
+2
⋀
k
 and
→
b
=2
⋀
i
+2
⋀
j
+λ
⋀
k
 are at right angle, then the value |
→
a
+
→
b
|−|
→
a
−
→
b
| is equal to
Validate
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