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KEAM 2017 Math Paper
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© examsnet.com
Question : 72
Total: 120
If the product of roots of the equation
m
x
2
+
6
x
+
(
2
m
–
1
)
=
0
is -1, then the value of m is
1/3
1
3
-1
-3
Validate
Solution:
We have.
m
x
2
+
6
x
+
(
2
m
−
1
)
=
0
∴
Product of roots
=
2
m
−
1
m
⇒
2
m
−
1
m
=
−
1
[∵ Product of roots
=
−
1
]
⇒
2
m
−
1
=
−
m
⇒
3
m
=
1
⇒
m
=
1
3
© examsnet.com
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