# TI-89 Titanium: Drawing the inverse.

• Jul 4th 2008, 11:42 AM
tupac
TI-89 Titanium: Drawing the inverse.
What do i need to press if i want to draw the inverse of f(x)=x+5x^4 for example?(Doh)
• Jul 4th 2008, 12:15 PM
Chris L T521
Quote:

Originally Posted by tupac
What do i need to press if i want to draw the inverse of f(x)=x+5x^4 for example?(Doh)

The only thing I can think of at the moment is this: write the equation as parametric equations. Since $y=x+5x^4$, the inverse would be $x=y+5y^4$. Now, if we left $y=t$, then $x=t+5t^4$.

You can now plug this into your calculator. Make sure you're in parametric mode!

http://img.photobucket.com/albums/v4...LT521/PAR1.jpg

http://img.photobucket.com/albums/v4...LT521/PAR2.jpg

http://img.photobucket.com/albums/v4...LT521/PAR3.jpg
• Jul 4th 2008, 12:15 PM
galactus
I do not know of such a capability. If you find one, let me know.