# Writing an equation based on a table

I woutould like to know how to find the equation of a quadratic function from its graph, including when it does not cut the x-axis. Modelling This is a good question because it goes to the heart of a lot of "real" math. Often we have a set of data points from observations in an experiment, say, but we don't know the function that passes through our data points. A1 references Insert a formula in a table cell Select the table cell where you want your result. If the cell is not empty, delete its contents. Use the Formula dialog box to create your formula. You can type in the Formula box, select a number format from the Number Format list, and paste in functions and bookmarks using the Paste Function and Paste Bookmark lists. Update formula results In Word, the result of a formula is calculated when it is inserted, and when the document containing the formula opens.

In Outlook, the result of a formula is only calculated when it is inserted and won't be available for the recipient of the email to edit. You can also manually update: The result of one or more specific formulas The results of all formulas in a specific table All the field codes in a document, including formulas Update the result of specific formulas Select the formulas that you want to update.

You can select multiple formulas by holding down the CTRL key while you make selections. Do one of the following: Right-click the formula, then click Update field. Update all the formula results in a table Select the table that contains formula results that you want to update, and then press F9. Update all the formulas in a document Important: This procedure updates all the field codes in a document, not just formulas.Linear Equations and Arithmetic Sequences (continued) So, the equation for the line through the points is y 13 3x, or y 3x In this course, you will use x and y to write linear equations and n and u n to write recursive and explicit formulas for sequences of discrete points.

A table of values shows a list of the values for an independent variable, x, matched with the value of the dependent variable, y.