For what values of x is the rational expression below undefined? x-7/x^2-7x-8 check all that apply a. 1 b. 7 c. 8 d. -8 e. -7 f. -1

We have

f(x)=(x-7)/(x²-7x-8)

resolving the quadratic equation
using a graph tool-------- > see the attached figure
x=-1  x=8
therefore
(x-7)/(x²-7x-8)=(x-7)/[(x+1)*(x-8)

the answer is  -1  and  8

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