To insert an equation using the keyboard press ALT and then type the equation. In the Object type box click Microsoft Equation 30 and then click OK. To add cations for equations in your document do the following.
To use a built-in formula select Design Equation.
For more information see Use Math AutoCorrect rules outside of math regions check box. Then click the Insert tab in the Ribbon. This site uses Akismet to reduce spam. If the cell is not empty delete its contents.