SOLUTION: find all numbers not in the domain of the function f(x)=x^2-16 over x^2-2x-8 help

Algebra ->  Functions -> SOLUTION: find all numbers not in the domain of the function f(x)=x^2-16 over x^2-2x-8 help      Log On


   

Question 44240: find all numbers not in the domain of the function
f(x)=x^2-16 over x^2-2x-8
help
Answer by Nate(3500) About Me  (Show Source):
You can put this solution on YOUR website!
f(x) = (x^2-16)/(x^2-2x-8)
f(x) = ((x + 4)(x - 4))/((x - 4)(x + 2))
You can not divide by zero.
x+-+4+=+0 and x+%2B+2+=+0
x+=+4 and x+=+-2