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Change base log
The TI 86 has two logarithmic functions: natural logarithm (ln) and common (decimal) logarithms (log). If you need the logarithm in any other base than e or 10 you need to use one of the two equivalent expressions
log_b(x) =ln(x)/ln(b) =log(x)/log(b)
Here b is the value of the base of the logarithm and x is the argument (the value whose logarithm you are seeking). Of course the argument x must be a positive number.
Note: On the TI 86 the log function can calculate the logarithm of a complex number, according to the manual.
on Sep 22, 2013
Try adjusting the contrast. It may be too dark. Turn the calculator on press the 2nd key and the down arrow. This is how to adjust the contrast and will lighten the screen. You can darken the screen the same way, but use the up arrow instead.
on Mar 25, 2013
How to calculate cube root on simple calculator
That depends on how simple a calculator. I'll give some examples below for calculating the cube root of 8.
On a TI-86, press 3 2nd [MATH] F5 MORE F4 8 ENTER
If the calculator has a "^" or "y^x" key, raise 8 to the 1/3 power. Again, on the TI-86, press 8 ^ ( 1 / 3 ) ENTER
If the calculator has a logarithm key, take the logarithm, divide it by three, then take the antilogarithm. Again, on the TI-86, press 2nd [e^x] ( ln 8 / 3 ) ENTER
On a slide rule, place the hairline over the number on the K scale and read the cube root on the D scale.
on Jan 10, 2013
Calculator not turning on
TI calculators have an annoying habit of dimming the screen when the batteries are changed so as to appear not to be turning on. Turn the calculator on (or at least press the ON button). Press and release the 2nd button, then press and release the up-arrow button. Repeat the process several times and see whether the screen darkens.
on Sep 25, 2012
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