The mode of formulas
One of the most popular formulas in the school math course is the formula for the difference of squares. This formula often allows you to simplify the process of calculating various numerical and algebraic expressions. This paper shows how to use the formula for the difference of squares to solve problems that usually come down to solving quadratic equations. To do this, use the substitution known to mathematicians of antiquity. In particular, it was used by the outstanding Central Asian mathematician Al Khorezmi, with whose name two basic mathematical words are directly connected: algebra and algorithm