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Problem
Problem
If the roots of the equation
b
x
2
+
c
x
+
a
=
0
bx^2 + cx + a = 0
b
x
2
+
c
x
+
a
=
0
be imaginary, then for all real values of
x
x
x
, the expression
3
b
2
x
2
+
6
b
c
x
+
2
c
2
3b^2 x^2 + 6bcx + 2c^2
3
b
2
x
2
+
6
b
c
x
+
2
c
2
, is a. less than
(
−
4
a
b
)
(-4ab)
(
−
4
ab
)
b. greater than
4
a
b
4ab
4
ab
c. less than
4
a
b
4ab
4
ab
d. greater than
(
−
4
a
b
)
(-4ab)
(
−
4
ab
)
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