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Diagnostic Test 1 Practice Test
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Q1
For what value(s) of 
is the expression ![](https://vt-vtwa-assets.varsitytutors.com/vt-vtwa/uploads/formula_image/image/89746/gif.latex $"$\frac{x^{2}$$$-1}{x^{2}$+9}") undefined?
For what value(s) of