# Re: Gaphic of a logarithmic function

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Posted by Soroban on September 11, 2002 at 02:43:00:

In Reply to: Gaphic of a logarithmic function posted by Pilar on September 10, 2002 at 23:32:16:

: I need to graph the function f(x)=3Log(x-2)-5, please somebody help me.

It would help if you were a bit more specific.

If you're out of graph paper, buy some.

If your TI-83 is broken, borrow one.

If you're talking about "plotting points", grab your calculator and plug in
values of x (greater than 2) and find the corresponding y-values.
Then plot-plot-plot.

From the function, I would guess that you are expected to "read" it
and make the indicated changes.

If you know what f(x) = log(x) looks like, you're in luck!

I'll say this very casually (downright sloppy).

The -2 moves the graph 2 units to the right.
The -5 moves the graph 5 units down.
The 3 "stretches" the graph, so that points are 3 times higher
or 3 times lower than they were (relative to the X-axis).

If I've missed the point, it's not my fault.

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