Question 1196945
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Determine the zeros of the f(x)=x^2-3x-4 then estimate the instantaneous rate of change in f(x) at the zeros
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Instantaneous rate of change of a function at a given point 
is the value of the derivative of the function at this point.


Having this hint, complete the job on your own.



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Keep in mind that estimations given in the post by MathLover1, are absolutely   {{{highlight(highlight(W-R-O-N-G))}}}.


Surely,  the meaning of the term  " estimate "  is quite wide,

but making estimation in this way as  MathLover1  does it  ( obtaining the answer  0  (zero) ), 
tells that she is not familiar with the meaning of this term and does not understand what she is doing / teaching . . . 



                    God,  save us from such tutors . . .