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3.11 The natural logarithm

Worksheet
Natural logarithm
1

Find the value of each of the following correct to four decimal places:

a

\ln 94

b

\ln 0.042

c

\ln 78^{4}

d

\ln \left( 18 \times 35\right)

2

Consider x=\ln 31. Find the value of x, correct to two decimal places.

3

Use the properties of logarithms to express each of the following without any powers or surds:

a
\ln y^{2}
b
\ln \dfrac{1}{y^2}
c
\ln \sqrt{y}
d
\ln \sqrt[3]{y}
4

Use the properties of logarithms to rewrite - 2 \ln x with a positive power.

5

Rewrite each of the following as the sum and difference of logarithms:

a
\ln \left(\dfrac{15}{8}\right)
b
\ln \left(\dfrac{p q}{r}\right)
c
\ln \left(\dfrac{19}{7}\right)
6

Rewrite each of the following expressions as a single logarithm:

a

\ln 3 + \ln 5

b

\ln 24 - \ln 4

c

\ln 8 - \ln 32

d

\ln \left( 3 x\right) + \ln \left( 5 y\right)

7

Which expression is equivalent to 2 \ln \left( 7 x\right) for x > 0?

A

\ln \left( 14 x\right)

B

\ln 14 + \ln x

C

\ln 49 + \ln x

D

\ln \left( 49 x^{2}\right)

8

Simplify:

a
e^{\ln w}
b
\ln\left(e^x\right)
c
2^{\ln e^y}
d
e^{\ln x}\times e^{\ln y}
e
\ln \left( \dfrac{e^{x}}{e} \right)
f
\ln e^x - \ln e^y
g
\ln \left( \dfrac{1}{e^x} \right)
h
\ln \left( \dfrac{e^5}{e^x} \right)
9

Evaluate each of the following expressions:

a

\ln e^{3.5}

b

\ln e^{4}

c

\sqrt{6} \ln \left(e^{\sqrt{6}}\right)

d

\ln \left(\dfrac{1}{e^{2}}\right)

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