Limits at Infinity of a Rational Function

Find \(\displaystyle \lim_{x\to \infty} f(x)\) and \(\displaystyle \lim_{x\to -\infty} f(x)\) for the following function. If a limit does not exist because the function has infinite behavior, use limit notation to describe the infinite behavior.
\[
    f(x)=\dfrac{-4x^3-12x^2+15}{16x^3+14x-17}
\]

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