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COMEDK Exam 2019 Solved Paper
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© examsnet.com
Question : 162 of 180
Marks:
+1
,
-0
The real root of the equation
x
3
−
6
x
+
9
=
0
is
-6
-9
6
-3
Validate
Solution:
We have,
x
3
−
6
x
+
9
=
0
⇒
(
x
+
3
)
(
x
2
−
3
x
+
3
)
=
0
⇒
x
+
3
=
0
[
∵
x
2
−
3
x
+
3
≠
0
,
x
∈
R
]
⇒
x
=
−
3
© examsnet.com
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