Question

Use the formula
d
dx
ln f(x)
=
f'(x)
f(x)
to compute the following.
d
dx
ln(9x)
=
d
dx
ln(4x)
=

Answer 1

d/dx (ln (f(x)) = (f'(x))/(f(x))

Answer 2

find d/dx [ln(9x)]

Answer 3

Soooo derivative of ln(9x)?

Answer 4

If so, it's 9/9x --> 1/x

Answer 5

makes sense, thanks