Question about Texas Instruments TI-30XA Calculator
On TI-30xA when I use the EE button, it returns an incorrect value when I hit "=" to go to decimal form. It appears this is only true with negative exponents.
For instance: key stroke sequence: 10, [EE], 5, -, returns as .0001
We all know this should be .00001. This can cause great errors, espcially since this is one of a few allowed calculators on standardized tests such as the Professional Engineers Exam.
Note if you hit 10, [y^x], 5,-, key sequence you get the right values.
Can anyone else with a TI-30Xa confirm my problem. Is it a software error that all TI's will have? Or did I get a "lemon"?
I dont think you got a lemon.
You acn always enter the powers of 10 as 10, [y^x], but is is less efficient than the EE key
This EE representation is a shortcut.
If you want 10 to the 5th power you just enter [2nd] [EE] 5 and the calculator displays 100000. Of course if you need any other number multiplying the power of ten you enter the following e.g. 2.677[x][2nd][EE]5.
You will not get any error with a positive exponent. But if your exponent is negative you should use the change signe key to the left of ENTER and symbolized by (-)
To avoid all errors I would use parentheses to enclose my exponent.
Here is how to explain the seemingly erroneous result
10 [EE] 5 ) (-) is interpreted by your calculator as 10x(10^(-5)) which evaluates correctly to 0.0001 because [EE] by itself stands for 10^ .
Hope it clarifies this point for you.
By the way some new calculators (Casio) don't have this EE key. Instead you find a key labeled x10^X .
Hope it helps
Posted on Aug 19, 2009
You're pressing the wrong key. If you want a negative exponent, use the change-sign key ([+<>-] is the closest I can come to drawing the key here), not the subtract key.
Posted on Feb 05, 2010
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