But WHY?!

[wanton skiff]

How do we go from f of x equals x squared to f of 2 equals 2 squared??! Where does the 2 come from?

[fallow holly]

I think the 2 is solely for an example

It doesn't come from anything else, it is just a random number that they used to show an example

It could have been 3 instead of 2 for instance.

[wanton skiff]

Ah okay so you can just substitute the x for whatever is needed

[fallow holly]

Yep

So if you want f(3), just substitute x by 3 in your function

[solid locust]

.close