# Robert Penner Easing Equations! How Do I use Them

**URL:** https://forum.kirupa.com/t/robert-penner-easing-equations-how-do-i-use-them/70942
**Category:** flash
**Created:** [November 19, 2004, 2:23am UTC](https://forum.kirupa.com/t/robert-penner-easing-equations-how-do-i-use-them/70942 "2004-11-19T02:23:10Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![nugget](https://avatars.discourse-cdn.com/v4/letter/n/ebca7d/32.png) [@nugget](https://forum.kirupa.com/u/nugget)
#### Post date: [November 19, 2004, 2:23am UTC](https://forum.kirupa.com/t/robert-penner-easing-equations-how-do-i-use-them/70942/1 "2004-11-19T02:23:10Z")

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Hey,  
I am just wandering how do i use the equations I downloaded from [robertpenner.com](http://robertpenner.com).

when ever i try even working out of the book i get error messages like

**Error Scene=Scene 1, layer=Layer 1, frame=1:Line 350: There is no method with the name ‘easeOutBounce’.**  
**return(Math.easeOutBounce(t \* 2 - d, 0, c, d) \* 0.500000 + c \* 0.500000 + b);**

Why does it say there is no method with the name bounceEaseOut

Can someone tell me who i can use these in my flash movies. I tried everything out of his book and i still get it wrong.

Thanks nugget