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Manipal Entrance Test 2017 Math Paper
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© examsnet.com
Question : 1
Total: 70
If the roots
x
2
+
a
x
+
9
=
0
are complex, then
a
<
6
a
<
−
6
|
a
|
<
6
|
a
|
>
6
Validate
Solution:
Since, roots are complex.
∴
a
2
−
36
<
0
(∵ discriminant < 0)
⇒
a
2
<
36
⇒
|
a
|
<
6
© examsnet.com
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