SOLUTION: What numbers can not be used for X and Why? Can someone please explain what to do to solve this problem? thanks! (X^2 - 4)/(9

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Question 98678: What numbers can not be used for X and Why? Can someone please explain what to do to solve this problem? thanks!
(X^2 - 4)/(9 - x^2)
Found 2 solutions by 303795, edjones:
Answer by 303795(602) (Show Source):
You can put this solution on YOUR website!
The bottom (or denominator) of the problem cannot be equal to zero as division by zero is undefined.
ie (9 - x^2)cannot equal zero.
Factorise (9 - x^2)
ie(3-x)(3+x) cannot equal zero.
So x cannot be equal to 3 and it cannot be equal to -3.

Answer by edjones(8007) (Show Source):
You can put this solution on YOUR website!
when x=3 or -3 the denominator becomes 0 and division by 0 is not allowed.
othewise x can be any number from -infinity to +infinity.
Ed

SOLUTION: What numbers can not be used for X and Why? Can someone please explain what to do to solve this problem? thanks! (X^2 - 4)/(9 - x^2)