For how many values of $x$ is the expression $\frac{x^2-9}{(x^2+2x-3)(x-3)}$ undefined?
Question:
For how many values of $x$ is the expression $\frac{x^2-9}{(x^2+2x-3)(x-3)}$ undefined?
Answer:
Let's think step by step.

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For how many values of $x$ is the expression $\frac{x^2-9}{(x^2+2x-3)(x-3)}$ undefined?
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