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Here's how to Lock, Unlock or Hide Formulas in Excel.

i. You can lock and hide formulas in Excel.

To hide formulas, follow these steps:

1. Select the cells that contain the formulas you want to hide.
2. On the Home tab, in the Cells group, click Format.
3. In the Format Cells dialog box, on the Protection tab, select the Hidden check box.
4. Click OK.

To lock formulas, follow these steps:

1. Select the cells that contain the formulas you want to lock.
2. On the Review tab, in the Changes group, click Protect Sheet.
3. In the Protect Sheet dialog box, in the Sheet protection section, select the Lock cells check box.
4. In the Password to protect sheet box, type a password.
5. Click OK.

Once you have hidden or locked formulas, users will not be able to see or edit them. However, they will still be able to use the formulas to calculate values.

Here are some additional tips for hiding and locking formulas in Excel:

* **Only hide or lock formulas that you do not want users to see or edit.** If you need users to be able to see or edit the formulas, do not hide or lock them.
* **Use a strong password when you protect your sheet.** A strong password will help to prevent unauthorized users from accessing your sheet.
* **Consider using a cell style to format your formulas.** Cell styles can help to make your formulas look more professional and can also help to prevent users from accidentally editing them.

ii. Locking a formula in Excel means that users will not be able to edit the formula. This can be useful if you want to protect your formulas from unauthorized changes. To lock a formula, follow these steps:

1. Select the cells that contain the formulas you want to lock.
2. On the Review tab, in the Changes group, click Protect Sheet.
3. In the Protect Sheet dialog box, in the Sheet protection section, select the Lock cells check box.
4. In the Password to protect sheet box, type a password.
5. Click OK.

Once you have locked the formulas, users will not be able to edit them. However, they will still be able to use the formulas to calculate values.

Here are some additional tips for locking formulas in Excel:

* **Only lock formulas that you do not want users to edit.** If you need users to be able to edit the formulas, do not lock them.
* **Use a strong password when you protect your sheet.** A strong password will help to prevent unauthorized users from accessing your sheet.
* **Consider using a cell style to format your formulas.** Cell styles can help to make your formulas look more professional and can also help to prevent users from accidentally editing them.

I hope this helps!

Here are some reasons why you might want to lock formulas in Excel:

* **To protect your intellectual property.** If you have created formulas that are valuable to your business, you may want to lock them to prevent unauthorized users from copying them.
* **To prevent errors.** If you have formulas that are complex or that are used in a critical part of your workbook, you may want to lock them to prevent users from accidentally making changes that could cause errors.
* **To improve performance.** When formulas are locked, Excel does not need to recalculate them when users make changes to other cells in the workbook. This can improve performance, especially for large workbooks.

I hope this helps!