Determine the real values of x that causes the given function to be: a) zero
b) undefined
c) positive
d) negative
(i) f(x)=(x -8)^3/|x+1|

(ii) f(x)=((x-4)^2 (x-7)^5 )/(x+6)^1/2

(iii) f(x)=(x^2 -9)/ (4x^2 +1)

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