Question about Texas Instruments BA-II Plus Calculator

Using e on the BA II plus financial calculator

I need to solve the problem 20-18e^(-.10), and I don't know how to enter it into my calculator. The answer should be 3.71, but i keep on getting 19.83.

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Hello,
To use the exponential function, you must enter the number then press [2nd][e to the x] or [e^x] for short.

e^(-0.1) is entered as (-)0.1 [2nd][e^x], where (-) is the change sign key
You will need to use extra parentheses to avoid errors.

20 - 18*( (-)0.1 [2nd][e^x] ) [=]
The Minus sign between 20 and 18 is the regular one. The (-) before the 0.1 is the change sign key (-) or sometimes labeled +/-. The asterisk is the multiplication sign.
Hope it helps.

Posted on Oct 15, 2009

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