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Mathematics
Problem
The range of values of
a
a
a
so that all the roots of the equation
2
x
3
−
3
x
2
−
12
x
+
a
=
0
2x^3 - 3x^2 - 12x + a = 0
2
x
3
−
3
x
2
−
12
x
+
a
=
0
are real and distinct, belongs to a.
(
7
,
20
)
(7, 20)
(
7
,
20
)
b.
(
−
7
,
20
)
(-7, 20)
(
−
7
,
20
)
c.
(
−
20
,
7
)
(-20, 7)
(
−
20
,
7
)
d.
(
−
7
,
7
)
(-7, 7)
(
−
7
,
7
)
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