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Find the slope of the tangent to the curve $y = 3x^4 – 4x \; at\; x = 4.$

$\begin{array}{1 1} 764 \\ -764 \\ 765 \\ -765 \end{array} $

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  • If $y=f(x)$ then $\large\frac{dy}{dx}$=slope of the tangent to $y=f(x)$ at point $P$.
Step 1:
Given $y=3x^4-4x$
Slope of the tangent to the given at $x=4$ is given by,
Step 2:
The slope at the given point $x=4$ is
answered Jul 10, 2013 by sreemathi.v

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