D. Exponents, Radicals, and the Calculator

Symbols and function keys on different scientific calculators can vary significantly. The generic steps below highlight some of the basic calculator skills you should be familiar with when working with radical and exponential expressions. Because not all calculators require the same sequence of keystrokes, you may need to experiment with your particular device. The user manual for your calculator would be an excellent reference tool and may be available online if you don't have a hard copy.

Here are some sample keystrokes for evaluating radical and exponential expressions using a calculator.

Example 1

Evaluate 42 using a calculator.


 

Example 2

Evaluate 43 using a calculator.


Note that the previous two examples are evaluated very differently. Because squaring values is so common, most calculators have a special key for that very purpose. However, for all other types of powers, it is required that you input the value of the exponent.

Example 3

Evaluate using a calculator.


 

Example 4

Evaluate using a calculator.



Just as with squaring, finding the square root of a number is a very common calculation and as such, most calculators have a special key for that purpose. However, for all other radicals, it is required that you input the value of the index.