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The EE (or x10^x on Casios) does give a syntax error if you use it with decimal exponents, but the expressions do calculate correctly if you use the full expression with the general power key. The EE key is a shortcut and may have been designed to accept only integer values for the exponents. I tried that on Casio and the TI calculators.
Use the (-) key (just to the right of the decimal point key) instead of the - key when entering a negative number (not just exponents). - is used to subtract one value from another. (-) is used to negate a value. - operates on two numbers, (-) operates on one.
Which exponent function? To enter an exponent of ten, use 2nd [EE]. To raise ten to an exponent, use 2nd [10^x]. To raise e to an exponent, use 2nd [e^x]. To raise an arbitrary number to an exponent, use ^.
If you want to raise a number to another, use the ^ key located just above the divide key.
For natural antilogarithm (exponentiation of e), use 2ND [e^x] (the shifted function of the LN key). For common antilogarithm (exponentiation of 10), use 2ND [10^x] (the shifted function of the LOG key). To enter a decimal exponent as part of a number, use 2ND [EE] (the shifted function of the comma key, located just above the 7 key.
You cannot use a letter as an exponent, unless you stored a numerical value in memory B (EX: 3 [STO>] [ALPHA] B stores value 3 in B) For any numerical value of exponent ( positive, negative, integer, fraction, what have you) you use the general power key, marked with a caret [^] under the [CLEAR] key.
Example: To enter 15 to power 5 Type in 15 Press [^] key Type in the value of the exponent (5) and press [ENTER] You get 759375 as result.
Press the right-arrow key to tell the calculator you're done with the exponent. Otherwise the calculator thinks you're typing in a very complicated exponent.
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