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Mathematics
Problem
For a differentiable function
r
r
r
, the second derivative is
r
′
′
(
x
)
=
4
x
(
x
−
5
)
r''(x)=4x(x-5)
r
′′
(
x
)
=
4
x
(
x
−
5
)
. Identify all
x
x
x
-values where the concavity of
r
r
r
changes.
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