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Question about Texas Instruments TI-89 Calculator

# My ti-89 titanium won't graph logarithms (y1=22log(10)x)

It shows a straight line going through the point (0,0) terminus at (1,10), (-1,-10) instead of a curved line as it should show...What am I doing wrong?

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### kakima

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The graph of y=22log(10) is a straight line, though it should go through (0,0) and (1,22). Log(10) is a constant 1, so the function is simply y=22x .

If you want "twenty-two times log-base-ten of x", write it as 22*log(x) .

Posted on Aug 12, 2012

### Stevan Milanovic

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See capture image below

Posted on Feb 29, 2016

### Anonymous

Ok, try these two things and you should be just fine.
1.) Check your range for your graph. It is possible that the range you are using isnt large enough to show the curve. Also try using Z-fit vs Z-st. These are options that your calculator will give you once the equation is graphed.
2.) Place a parenthesis around the 2x, make sure that you and the calculator are both using the same order of operations. This move mill ensure that the calculator will multiply the variable, x, by two and then do the exponential.
This should do it!
Happy Graphing!

Posted on Jul 25, 2010

### k24674

SOURCE: I graphed Y=tan(x) on two

Check the angle unit. If Angle unit is set to degree and window is about (-10,10) for X and (-10,10) for Y, you get a straight line. See screen capture.

With radian units the graph looks as follows.

Check the calculator configuration.

Posted on Jun 10, 2011

### Anonymous

SOURCE: I have an TI-84 and

when you do your regression (stat --> calc --> linReg/QuadReg/whichever regression you're doing)) make sure you put the equation into Y1 before going to the table.

Posted on Sep 17, 2011

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