# how to apply chain rule and product rule on Ti-89

• Mar 16th 2009, 05:02 AM
User Name
how to apply chain rule and product rule on Ti-89
Hi to all great members(Happy)

has anyone know a trick to apply these rules in a ti-89?

I can't really get the right answer for this equation:(x^2+4x+4)^2
which cane be done by the chain rule.

all the best.
• Mar 16th 2009, 07:00 AM
Jameson
Because you are mentioning the chain rule, you must be referring to derivatives. The TI-89 can easily take the derivative of a problem like the one you posted. It's under Calc -> Derivative, or something like that. The syntax I believe is find the derivative function on the 89 under calc, input the expression you want to be differentiated, then put a comma and then x. That tells the calculator that x is the variable of differentiation. If you want to apply it at a certain point you can put another comma and the point I believe. Either way, add a closing parenthesis.
• Mar 16th 2009, 08:03 AM
skeeter
Quote:

Originally Posted by User Name
Hi to all great members(Happy)

has anyone know a trick to apply these rules in a ti-89?

I can't really get the right answer for this equation:(x^2+4x+4)^2
which cane be done by the chain rule.

all the best.

see the screenshot ... calculator syntax is highlighted on the bottom line.
• Mar 16th 2009, 01:33 PM
User Name
Quote:

Originally Posted by Jameson
Because you are mentioning the chain rule, you must be referring to derivatives. The TI-89 can easily take the derivative of a problem like the one you posted. It's under Calc -> Derivative, or something like that. The syntax I believe is find the derivative function on the 89 under calc, input the expression you want to be differentiated, then put a comma and then x. That tells the calculator that x is the variable of differentiation. If you want to apply it at a certain point you can put another comma and the point I believe. Either way, add a closing parenthesis.

Thanks buddy, I know to find X we should add comma and than x on the end of the equation, is there anything else we can put there? like to find tangent can we like put x=2 to find normal and tangent?
Quote:

Originally Posted by skeeter
see the screenshot ... calculator syntax is highlighted on the bottom line.

Thanks a lot!!!
now i know what was my mistake! (Happy)
• Mar 23rd 2009, 06:45 AM
earboth
Quote:

Originally Posted by User Name
... is there anything else we can put there? like to find tangent can we like put x=2 to find normal and tangent?

Thanks a lot!!!
now i know what was my mistake! (Happy)

If you want to calculate the slope of the tangent for a specific x-value then you can add the x-value by using the "|" operator. That's the key directly below the equal sign. See attachment.

The syntax is highlighted in the input line.