x^2 is "x squared."
x^3 is "x cubed."
For anything else, we use the ordinal name for the exponent.
For example, x^5 is "x to the fifth power" or, more often, "x to the fifth" for short.
x^n is "x to the nth."
Notations like x^5 are used in situations where there is no capability for mathematical typesetting. It is used casually online, in most modern computer languages, and in many spreadsheets. In typeset material, the ^ symbol would not be used, and the exponent would be written as a superscript, and set in smaller type than the letter "x."

November 11, 2017

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Based on your second comment, Dan, i think you mean x^2. This would be read as "x squared plus two x minus three".

November 11, 2017

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Yes, that's what I want to know.
Your answers help me a lots. (^_^)

November 11, 2017

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No problem. In case you're wondering, x^3 is called "x cubed" and x^n (where n is higher than 3), is called "x to the power of n" (replace n by any number).

November 11, 2017

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Sorry, I uesd the wrong symbol to make you misunderstand. :-P
Thank you for your help!

November 11, 2017

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