ashantirichards1 ashantirichards1
  • 01-03-2018
  • Mathematics
contestada

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

Respuesta :

calculista
calculista calculista
  • 01-03-2018
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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