Quadratic equations and algebraic expressions

Question

Can some one refer me to a web code for calculating quadratic equations and algebraic expressions.

Answer 1

This is a java code for quadratic equations
https://code.sololearn.com/cPKh61hU0144/?ref=app

Answer 2

https://www.khanacademy.org/math/

^There ya go. It's free to sign up and you can learn math there.