The Squeeze Theorem

Suppose that f(x) is a function such that

3x2−x+6≤f(x)≤Ax−33x^2-x+6 \leq f(x) \leq Ax-3
for x close to 4. In order for us to use the Squeeze Theorem to find lim⁡x→4f(x)\lim\limits_{x\to4}f(x), what is the value of A and the limit lim⁡x→4f(x)\lim\limits_{x\to4}f(x)?

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