How do I input negative exponents on a TI-89 calculator?

[elun]

can anyone help me to get this quotation "e^(-x)" on ti-89 ?
after i putting "-" before "x" and pressing enter , the error syntax happens ...

 

[Borek]

Have you tried to read manual? It says to not use "-" but (-) (button between dot and enter).

 

[elun]

ah tanx a lot i was searching for it all day long !

 

[TylerH]

Did you not notice there are two minus signs? Just kidding. It's okay, we've all done it.

 

[elun]

Did you not notice there are two minus signs? Just kidding. It's okay, we've all done it.

Yeah The 1st minus was the tricky one !

 

[Mark44]

I don't have a TI-89, but my guess is that one of the - keys is for subtraction, and the other is to change the sign of the operand.

 

[elun]

I don't have a TI-89, but my guess is that one of the - keys is for subtraction, and the other is to change the sign of the operand.

yeah exactly