L> Derivatives on the TI-89 Derivatives of Functionboy the TI-89

The derivative of a role tells you the slope or rate of adjust of the attribute. It"s a huge deal. Here are a couple of of the ways that the TI-89 deserve to calculate derivatives for you.

You are watching: How to find derivative on ti-89

The Derivative as a Function

Sometimes you are offered a duty and have to uncover the derivative of this function. For this, you should usage the TI-89"s "d) differentiate" function.

You can access the differentiation function from the
*
Calc food selection or from
*
.
*
The syntaxes of the feature is "d(feature, variable)." For example, if y = x3 - 2x + 4, the derivative of y with respect to x can be uncovered as in the display screen shot at appropriate.
*
The solution to the trouble "If x = 4t2 +1/t, find the derivative of x through respect to t" is displayed at appropriate.
*

Derivative at a Point

Sometimes you simply must know the worth of the derivative of a role (the slope of the function"s graph) at a particular suggest. Tbelow are a couple of ways to acquire this done. Suppose, for instance, that you desire to recognize the slope of the graph of y = 0.4x2 + 1 at the point wright here x = 3. Here are some methods:

You might usage the "d) differentiate" feature in addition to the "|" operator. A feasible benefit of this approach is that this attribute will attempt to return an exact value if possible.
*
If you graph the function, you can use "6: Derivatives" from the Math menu. Select "1: dy/dx" from the subfood selection, and then show the wanted point either by typing it and also pushing , or utilizing the blue arrowhead tricks to move the cursor and also then press .
*
The outcome of using "6: Derivatives is shown at best. Be mindful that the outcome of this attribute is always a decimal approximation.

See more: Butcher And The Boar - Butcher & The Boar Restaurant

*
Additionally, if you graph the attribute you have the right to use "A: Tangent" from the Math menu. Select the wanted suggest either by keying it and also pressing , or using the blue arrowhead keys to relocate the cursor and then press .
*
The outcome of using "A: Tangent" is displayed at right. Notice that this attribute draws the tangent line and provides its (approximate) equation.
*
last upday August 26, 2007 by JLStanbrough