Ononot — Let f(x) = \frac{\sqrt{x^2+a} - 3}{x-4}. Find a such that \l

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Limits & Continuityhard

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Let $f(x) = \frac{\sqrt{x^2+a} - 3}{x-4}$ . Find $a$ such that $\lim_{x \to 4} f(x)$ exists and is finite.