Feel free to add more terms if I missed any (to edit, the password is 1234)!
For the quadratic formula, here: https://www.youtube.com/watch?v=2lbABbfU6Zc
It'll be stuck with you forever now. Mwahaha :)
Tips for absolute value inequalities: Remember, great OR less AND. The greater than inequalities are always split up (OR) and the less than inequalities are always together (AND).
When dividing an inequality by a negative number, ALWAYS flip the inequality sign.