# Limit Definition of Derivative and Tangent Lines

Use the limit definition of the derivative to find all points on the graph of

$f(x) = 4x^3 - 12x^2 + 9x$

where the tangent lines to the graph have slope zero.

Posted by Will Lynch a year ago

## Related Problems

Find the derivative of the following function using the limit definition of derivative,

$f(x) = 8x + 4$

Use the definition of derivatives to find the derivative of the following function,

$f(x) = \sqrt{x - 1}$

Find the slope of the tangent line to

$f(x) = \sqrt{x}$

when x = 1

Find the slope of the tangent line to

$f(x) = \frac{1}{x}$

when x = 4