SOLUTION: how can i find all the values of a undefined rational expression? like r + 6 / r^2-r-6? asap

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Question 331808: how can i find all the values of a undefined rational expression? like r + 6 / r^2-r-6? asap
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
find all the values of a undefined rational expression? like
%28r+%2B+6%29%2F%28r%5E2-r-6%29
:
the expression is undefined when the denominator = 0, therefore solve
r^2 - r - 6 = 0
Factors to
(r-3)(r+2) = 0
two values
r = 3
and
r = -2
:
:
Substitute these values into the denominator, r^2 - r - 6, and you will see
it makes the denominator 0, right?