Here is an easy to use Equation Editor. Just pick the symbols you want, change the a's and b's to numbers or letters that you want it to be. When you are content with your equation, click the preview and select save. Save it somewhere that you can find it. You can then insert the image into any document.

Tips:

To raise more than one thing to a power, use { } around the exponent. x^{n + 1} will look like:

Tips: