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Problem
Problem
If the function
f
(
x
)
=
x
4
+
b
x
2
+
8
x
+
1
f(x) = x^4 + bx^2 + 8x + 1
f
(
x
)
=
x
4
+
b
x
2
+
8
x
+
1
has a horizontal tangent and a point of inflection for the same value of
x
x
x
, then the value of
b
b
b
is equal to a. -1 b. 1 c. 6 d. -6
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