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Problem
Problem
If
α
,
β
,
γ
,
δ
\alpha, \beta, \gamma, \delta
α
,
β
,
γ
,
δ
are the roots of equation
x
4
+
4
x
3
−
6
x
2
+
7
x
−
9
=
0
x^4 + 4x^3 - 6x^2 + 7x - 9 = 0
x
4
+
4
x
3
−
6
x
2
+
7
x
−
9
=
0
, the value of
∏
(
1
+
α
2
)
\prod (1 + \alpha^2)
∏
(
1
+
α
2
)
is a. 9 b. 11 c. 13 d. 15
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