Solution 15504: Entering Negative Exponents on the TI-30Xa Scientific Calculator.
How are negative exponents entered on the TI-30Xa scientific calculator?
Two keys can be used to enter negative exponents on the TI-30Xa scientific calculator; the [y^x] key or the [EE] key. The [y^x] key is used for all exponents while the [EE] key is used for scientific notation only.The examples below will demonstrate how to use both keys:
For Example: Entering 7^-2.
1) Press  [y^x]  [+/-] [=].
2) The calculator will display: 0.20408163.
For Example: 1*10^-3.
1) Press  [EE]  [+/-] [=].
2) The calculator will display: 0.001
Please see the TI-30Xa and TI-30Xa Solar guidebook for additional information.