Posted by **joclyn** on Saturday, October 3, 2009 at 8:10pm.

find the numerical deriviative of the given function at the indicated point. use h=0.001. is the function differentiable at the indicated point?

4x- x^2, x=0

- math -
**Reiny**, Saturday, October 3, 2009 at 9:27pm
Looks like you are starting the concept of a derivative and are finding it by First Principles

f(0) = 0

f(0+.001) = .003999

so the slope of the secant

= (.00399 - 0)/(.001 - 0)

= 3.999

as you make your value of h get closer to zero, the slope of the secant will approach the slope of the tangent (the derivative) and it will get closer and closer to 4.

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