SOLUTION: Find all the numbers for which the rational expression below is not defined: x^2-16 / x^2 - 3x+12

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Question 93189: Find all the numbers for which the rational expression below is not defined:
x^2-16 / x^2 - 3x+12
Answer by Nate(3500) About Me  (Show Source):
You can put this solution on YOUR website!
Undefined if the denominator is zero...
x^2 - 3x + 12 = 0
Use any way to solve...
x^2 - 3x = -12
(x - 3/2)^2 = -48/4 + 9/4 = -39/4
x = 3/2 +- i*sqrt(39)/2
None exist...