How to add a slow (ease) out to a keyframe without changing the key timings or adding any new keys?

[Danika5E69]

I'm working on an assignment for school and I'm really struggling with this last problem. I'm supposed to be adding slow (ease) outs, fast ins, and fast outs to keyframes but I'm not allow to change the key timings or add any new keys. How would I go about doing this? Here's a picture of my set up, and of the exact problem. Any help would be appreciated!

[thepixelsmith]

In AE, easy easing can be added by right–clicking (ctrl–click on mac) on a keyframe and choosing the type of ease from the Keyframe Assistant menu, Right–click > Keyframe Assistant > It gives you Easy Ease, Easy Ease In or Easy Ease Out. 
Easing can be modified/customized using the Graph Editor.

This tutorial from Andrew Farmer may help: https://youtu.be/sWzcHXoPbnE

[Danika5E69]

Thank you so much! Would that count as "changing the key timings" though? My instructions say to add the ease ins and outs without changing them, so I just want to make sure!

[Danika5E69]

Also "fast out" isn't an option when I go that route, and it's necessary I add that.

[thepixelsmith]

"Fast Out" isn't a type of keyframe easing, To be honest, I don't think I have ever heard anyone use that particular term before. Usually, I have always heard easing traditionally referred to as Slow In, and Slow Out or sometimes as Quick In and Quick Out.

https://www.animationmentor.com/blog/slow-in-and-slow-out-the-12-basic-principles-of-animation/

If you have two keyframes and you add Easy Ease In to the second one, the result is that the movement will slow down as it approaches the second keyframe. Since the total animation duration cannot change when add easing the only possible result the software can do is to speed up the animation as it leaves the first keyframe. I assume this is what your instructor is referring to.

[thepixelsmith]

I believe by changing the keys timing your instructor is referring to moving the keys around on the timeline. The distance between the keyframes is what controls the speed of the animation.

With easing the total duration of the animation is unchanged, you are changing the speed of an object as it moves through the animation.

[Danika5E69]

Awesome, thank you!

[Rick Gerard]

By far the easiest way to accurately control the speed of an animation is to use the Graph Editor and enable the Speed Graph. Please spend some time looking at this tutorial I produced. It should get you where you need to go in just a few minutes.