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Mathematics
Mathematics
Problem
If
f
(
x
)
=
π
(
x
+
7
−
4
x
−
9
)
f(x) = \pi \left( \frac{\sqrt{x+7} - 4}{x-9} \right)
f
(
x
)
=
π
(
x
−
9
x
+
7
−
4
)
, then find the range of function
y
=
ln
(
2
f
(
x
)
)
y = \ln(2f(x))
y
=
ln
(
2
f
(
x
))
.
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