Exponent ^^?

Only special characters available, like so x¹²³ª , and everything else you have to use conventional x^(power).


XR

You can just use ^ (for example, you could write x² as x^2). You can also copy/paste characters from online special character lists, such as:
http://www.yourhtmlsource.com/text/specialcharacters.html
or
http://www.lazytools.com/unicode-ascii/

Also, if you're using a desktop PC, you can use alt-characters. This means you hold down the alt button and punch a few numbers on the number pad (make sure num lock is on). Here's a list of them:
http://www.tedmontgomery.com/tutorial/ALTchrc.html

Example: Type "x alt+253" and the result should be x².

You can use Entities to add superscripts to your questions or answers, but it is only available for the superscripts 1 2 and 3,
for type & sup1 = ¹, & sup2 = ², & sup3 = ³ , type & sup1 without the space between them.
you can also check this website for a complete list of entities you can use
http://www.evotech.net/blog/2007/04/named-html-entities-in-alphabetical-order/

x^n is exponenciation x to the power n

On Windows, you can type them by Alt-codes :
http://www.usefulshortcuts.com/alt-codes/maths-alt-codes.php
- make sure NumLock is on
- while holding down Alt-key, type the corresponding Alt-code using the numbers on the numeric keypad (not the ordinary numbers above keys q..p)

Alt 252 ⁿ Power n
Alt 0185 ¹ To the power of 1
Alt 0178 ² squared
Alt 0179 ³ cubed

Or else, on any system, cut and paste them from that or similar webpage.

i just used /\2

so 4x-x/\2=6
(example)