Hello, Alex Escasinas!

You should be able to access our Polynomials lessons on Algebra > Polynomial expressions, equations, and functions.

Please note that having the unit Get ready for polynomials in the course Get ready for Precalculus does not mean that the content was removed from the site. Instead, we designed the Get ready for Precalculus course to help students master the most important skills they’ll need for Precalculus. What’s more, students can use our new courses to figure out where they may have gaps before actually taking Precalculus.

I hope this helps! Thank you for being a part of Khan Academy!

Dustin
Community Support