Why do we "complete the square"?

When 17 year old found a mistake on the PSAT exam

How to complete the square (when solving quadratic equations)

Solving a 'Harvard' University entrance exam

Factor ANY Quadratic Equation Without Guessing | Outlier.org

How to use the quadratic formula | Polynomial and rational functions | Algebra II | Khan Academy

How to Solve By Completing the Square (NancyPi)

500 years of NOT teaching THE CUBIC FORMULA. What is it they think you can't handle?

Taylor series | Chapter 11, Essence of calculus

You use the quadratic formula all the time, but where did it come from?

How Imaginary Numbers Were Invented

How To Calculate Any Square Root

But what is the Fourier Transform? A visual introduction.

The Man Who Solved the World’s Most Famous Math Problem

The SAT Question Everyone Got Wrong

04 - Completing the Square to Solve Quadratic Equations - Part 1

Completing the square (step by step instruction & visual illustration)

"New" Way To Solve Quadratic Equations That Everyone Is Talking About

How to Solve Quadratic Equations using Three Methods - When Leading Coefficient is Not One

Why is πr² the formula for a circle's area?

Completing the Square (1 of 2: Explanation)