Let $f(x) = 8x^3 - 15x^2 - 5$, $x \ge 1.5$. Find the value of $\frac{df}{dx}^{-1}$ at the point $x = 2004 = f(7)$. The value of $\frac{df}{dx}^{-1}$ at the point $x = 2004 = f(7)$ is $\boxed{}$. (Type a simplified fraction.)
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$f(x) = 8x^3 - 15x^2 - 5$ $\frac{df}{dx} = 24x^2 - 30x$ Show more…
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