SOLUTION: Which numbers cannot be used in place of the variable in each rational expression? 2x + 3 over X^2 - 16

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Question 329767: Which numbers cannot be used in place of the variable in each rational expression?
2x + 3
over
X^2 - 16
Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
(2x+3)/(x^2-16)
(2x+3)/(x+4)(x-4)
x cannot equal 4 or -4 because the denominator would be zero and division by zero is not allowed.
.
Ed