# Math Help - TI-89 Titanium: Drawing the inverse.

1. ## 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?

2. 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?
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!

3. I do not know of such a capability. If you find one, let me know.