"Functions: Zeros" action is used to compute the zeros of a function. If the action is not disabled by your instructor, you can use this action to compute the zeros of functions immediately. Below you can find the screenshots that explains how this action is used. 

Once the action is applied the zeros of the function will be listed as shown in the figure below. 

Hope you find this helpful. Please never hesitate to contact us here, in case you have questions or concerns related to this action.