Question: How to make a procedure (with single output and input) as a function in maple/ How to apply Secant method on a procedure?

Hello Everyone,
I have written a procedure which takes one input and gives one output. Now, if I want to find the root of that procedure (as in when my procedure gives a '0' output), Is there any method to do it directly?
One idea that I got is to use maple's inbuilt Secant method (with(Student[NumericalAnalysis]). But this method can be done only for functions. Hence, my question.
How can we convert a maple procedure which takes one input and gives one output into a maple function? Also, is there a method to apply secant method on such function?
Please consider the following example:

As can be seen, it seems not possible to apply secant method on procedures.
Can someone please help me in doing this or any alternate method to get the job done?