Questions: Exponential and Logarithmic Functions
Graphing a logarithmic function: Basic
Graph the logarithmic function.
g(x)=log(1 / 2) x
Plot two points on the graph of the function, and also draw the asymptote. Then click on the graph-a-function button.
Transcript text: Exponential and Logarithmic Functions
Graphing a logarithmic function: Basic
Graph the logarithmic function.
\[
g(x)=\log _{1 / 2} x
\]
Plot two points on the graph of the function, and also draw the asymptote. Then click on the graph-a-function button.
Solution
Solution Steps
Step 1: Find two points
We are asked to graph $g(x) = \log_{1/2}x$. Let us choose two $x$ values and find their corresponding $y$ or $g(x)$ values.
$x=1$:
$g(1) = \log_{1/2}(1) = 0$
So, $(1,0)$ is a point on the graph.
$x=2$:
$g(2) = \log_{1/2}(2) = -1$
So, $(2, -1)$ is a point on the graph.
Step 2: Find the asymptote
The function $g(x) = \log_{1/2} x$ is defined for $x > 0$. The graph will approach the $y$-axis (i.e., $x=0$) but will never touch it. Therefore, $x=0$ is a vertical asymptote.
Step 3: Plot the points and the asymptote
Plot the points (1,0) and (2, -1) on the coordinate plane. Draw the vertical asymptote at $x=0$. Draw a smooth curve passing through the plotted points that approaches but does not touch the vertical asymptote.
Final Answer:
The graph passes through the points $(1,0)$ and $(2,-1)$. The vertical asymptote is $x=0$. The graph should approach the $y$-axis but never touch it.