Question 1117218
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There is some mix-up in your understanding and in your input.


What they want from you is to find (to write an equation for) the function which has zeroes at assigned points x= -3, x= 1 and x= 4.


The simplest function which has the assigned zeroes (roots), is the third degree polynomial


f(x) = (x-(-3))*(x-1)*(x-4).


It is constructed as the product of linear binomials, associated with the given zeroes.


In more simple form it is 


f(x) = (x+3)*(x-1)*(x-4).


You can further to make distributive multiplication and open parentheses, if you want or if you need.
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Solved.