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The values of x for which the function text f left(...

This question belongs to Engineering Maths Calculus
Calculus
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The values of x for which the function $${\text{f}}\left( {\text{x}} \right) = \frac{{{{\text{x}}^2} - 3{\text{x}} - 4}}{{{{\text{x}}^2} + 3{\text{x}} - 4}}$$    is NOT continuous are

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Correct Answer: Option C
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