Few tasks have been as difficult as displaying mathematical equations in a document—until now. Word 2007 provides powerful equation-writing tools that allow you to insert a prepackaged equation as is, modify one as you want, or create a new one from scratch. Remember, however, that any equation you insert is the current version of that equation only; Word is unable to do any math with that equation.
Click in the document where you want to insert the equation.
On the Insert tab, click the down arrow at the right of the Equation button, and, in the gallery that appears, click the equation you want.
Use standard editing techniques, such as formatting text size and emphasis; or use the tools on the Equation Tools Design tab to insert different symbols, letters, or numbers or to change the equation into a linear form or to plain text.
Click outside the equation when you’ve finished working with it.