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Mathematics
Problem
14. For what values of
a
a
a
the function
f
f
f
given by
f
(
x
)
=
x
2
+
a
x
+
1
f(x)=x^{2}+a x+1
f
(
x
)
=
x
2
+
a
x
+
1
is increasing on
[
1
,
2
]
[1,2]
[
1
,
2
]
?
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