Stock prices are at their peak. Here
f
\displaystyle {f}
f
is the stock price. Then
f
′
(
x
)
=
0
,
f
′
′
(
x
)
<
0
\displaystyle {f}'{\left({x}\right)}={0},{f}{''}{\left({x}\right)}<{0}
f
′
(
x
)
=
0
,
f
′′
(
x
)
<
0
f
′
(
x
)
>
0
,
f
′
′
(
x
)
>
0
\displaystyle {f}'{\left({x}\right)}>{0},{f}{''}{\left({x}\right)}>{0}
f
′
(
x
)
>
0
,
f
′′
(
x
)
>
0
f
′
(
x
)
<
0
,
f
′
′
(
x
)
=
0
\displaystyle {f}'{\left({x}\right)}<{0},{f}{''}{\left({x}\right)}={0}
f
′
(
x
)
<
0
,
f
′′
(
x
)
=
0
f
′
(
x
)
>
0
,
f
′
′
(
x
)
=
0
\displaystyle {f}'{\left({x}\right)}>{0},{f}{''}{\left({x}\right)}={0}
f
′
(
x
)
>
0
,
f
′′
(
x
)
=
0
f
′
(
x
)
=
0
,
f
′
′
(
x
)
>
0
\displaystyle {f}'{\left({x}\right)}={0},{f}{''}{\left({x}\right)}>{0}
f
′
(
x
)
=
0
,
f
′′
(
x
)
>
0
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