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Limits & Continuityhard
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Let f(x)=x2+a−3x−4f(x) = \frac{\sqrt{x^2+a} - 3}{x-4}f(x)=x−4x2+a​−3​. Find aaa such that lim⁡x→4f(x)\lim_{x \to 4} f(x)limx→4​f(x) exists and is finite.