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VCE 11 Methods 2023

7.09 Graphs of logarithmic functions

Interactive practice questions

Consider the function $y=\log_4x$y=log4x, the graph of which has been sketched below.

Loading Graph...

a

Complete the following table of values.

$x$x $\frac{1}{16}$116 $\frac{1}{4}$14 $4$4 $16$16 $256$256
$y$y $\editable{}$ $\editable{}$ $\editable{}$ $\editable{}$ $\editable{}$
b

Determine the $x$x-value of the $x$x-intercept of $y=\log_4x$y=log4x.

c

How many $y$y-intercepts does $\log_4x$log4x have?

d

Determine the $x$x value for which $\log_4x=1$log4x=1.

Easy
3min

Consider the two graphs sketched below.

Easy
< 1min

Consider the graphs shown below.

Easy
< 1min

We are going to sketch the graph of $y=\log_2x$y=log2x.

Easy
4min
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Outcomes

U1.AoS1.2

qualitative interpretation of features of graphs of functions, including those of real data not explicitly represented by a rule, with approximate location of any intercepts, stationary points and points of inflection

U2.AoS1.19

sketch by hand the unit circle, graphs of the sine, cosine and exponential functions, and simple transformations of these to the form Af(bx)+c , sketch by hand graphs of log_a(x) and the tangent function, and identify any vertical or horizontal asymptotes

U2.AoS1.20

draw graphs of circular, exponential and simple logarithmic functions over a given domain and identify and discuss key features and properties of these graphs, including any vertical or horizontal asymptotes

U2.AoS1.8

logarithmic functions of the form f(x)=log_a(x), and their graphs and as the inverse function of y=a^x, including the relationships a^log_a(x)=x and log_a(a^x)=x

U2.AoS1.17

the key features and properties of the exponential functions, logarithmic functions and their graphs, including any vertical or horizontal asymptotes

U2.AoS1.16

characteristics of data which suggest the use of sine, cosine, exponential or logarithmic functions as an appropriate type of model for a given context

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