Use LOGEST with 3 topics: insert the function from the dialog box, type the formula directly, and review syntax and arguments; choose a topic from the index and follow the steps.

How-to Index

#	Topic	Membership
1	1. Enter LOGEST through the Insert Function dialog box	Free
2	2. Type the LOGEST formula directly in a cell	Free
3	3. View LOGEST syntax and argument details	Free

How-to Guide

1. Enter LOGEST through the Insert Function dialog box

Entry point: Formulas tab → Insert Function, or the fx button in the formula bar

Select the cell where you want to enter the formula.
Click the fx button in the formula bar, or click Insert Function on the Formulas tab.
Search for LOGEST in the Insert Function dialog box.
Select the function and click OK.
Enter each argument in the Function Arguments dialog box.
Click OK to finish entering the function.

Success Criteria

UI state: The target cell now contains the LOGEST function.
Next actions: You can continue editing arguments, press Enter to confirm, or copy the formula to other cells.

Tips While Using

Common mistakes: If you do not select the target cell first, the function may be inserted in an unexpected location.
Environment limits: If the dialog box does not show the expected result, first confirm that the current worksheet is editable.

2. Type the LOGEST formula directly in a cell

Entry point: worksheet cell area or formula bar

Select the cell where you want to enter the formula.
Type =LOGEST(...) directly in the cell or in the formula bar.
Press Enter to confirm.
If you want to review the argument structure, continue checking it after typing the opening parenthesis.

Success Criteria

UI state: The cell shows the calculation result, and the formula bar keeps the full formula.
Next actions: You can drag to fill, copy the formula, or continue editing the arguments.

Tips While Using

Common mistakes: If parentheses, separators, or argument ranges are incomplete, the formula may not calculate correctly.
Environment limits: Make sure the referenced range contains data that can be used for the current calculation.

3. View LOGEST syntax and argument details

Entry point: Formulas tab → Insert Function

Click Insert Function on the Formulas tab.
Type LOGEST in the search box.
Select the function to view its syntax and argument details.
Open the related help entry for more detailed information.

Success Criteria

UI state: You can see the LOGEST function name, syntax structure, or argument details.
Next actions: You can return to the worksheet and continue entering or editing the formula.

Tips While Using

Common mistakes: If you only check the function name without reviewing the argument order, the result may not match your expectation.
Environment limits: An internet connection is required when you open an external help page.