How to create a variable without assigning a value, so you can find the zero of the function?

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Andrew 2014-9-21

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https://ww2.mathworks.cn/matlabcentral/answers/155685-how-to-create-a-variable-without-assigning-a-value-so-you-can-find-the-zero-of-the-function

回答： Matt J 2014-9-21

I have to write a function that calculates the zero of a function if the function is inputted and the lower and upper bounds are given. I then have to bisect the bounds and determine where the zero is. I can't test my function because I don't know how to make a function without assigning a value to x. I just want a simple function like x^2+x-10 that I can use to calculate the zero and test my function. function [z]=a(x) z=x^2+x-10; end How would I make this function work without a numerical input for x?