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Problem
Problem
If the range of function
f
(
x
)
=
x
2
+
x
+
c
x
2
+
2
x
+
c
f(x) = \frac{x^2 + x + c}{x^2 + 2x + c}
f
(
x
)
=
x
2
+
2
x
+
c
x
2
+
x
+
c
,
x
∈
R
x \in R
x
∈
R
is
[
5
6
,
3
2
]
\left[\frac{5}{6}, \frac{3}{2}\right]
[
6
5
,
2
3
]
then
c
c
c
is equal to (a)
−
4
-4
−
4
(b)
3
3
3
(c)
4
4
4
(d)
5
5
5
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