You use the quadratic formula all the time, but where did it come from?
5:11
Is this quadratic equation "all real numbers" or "no solution"? Reddit r/maths
31:27
EXTREME quintic equation! (very tiring)
9:50
Why do we "complete the square"?
8:51
Proving the pq formula for solving quadratic equations
13:12
Helping niece. Getting very high numbers. Reddit Pythagorean thm & quadratic equation r/homeworkhelp
3:35
Skip the Quadratic Formula and Solve Tricky Quadratic Equations with Completing the Square Instead
4:59
Algebra teachers always want us to "rationalize the denominator", but why?
23:24