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UPSC NDA I 2014 Mathematics Paper
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© examsnet.com
Question : 5
Total: 120
The roots of the equation
2
a
2
x
2
–
2
a
b
x
+
b
2
=
0
when
a
<
0
and
b
>
0
are :-
[NDA I 2014]
Sometimes complex
Always irrational
Always complex
Always real
Validate
Solution:
D
=
4
a
2
b
2
−
8
a
2
b
2
=
−
4
a
2
b
2
<
0
Always complex
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