The difference of two squares is subtracting a square number from another squared number. And these numbers don’t have be perfect squares. Thankfully, difference of squares can be factored easily.
a² — b² is ubiquitous in mathematics, and it is also supercalifragilisticexpialidocious for algebra.
If we speak algebraically:(a + b)•(a — b) = a² + ba — ab -b² = a² — b²
But there is a different and beautiful way to represent a² — b². We can create multiple representations of this single concept, which is the beauty of mathematics. For instance, geometric objects are powerful in visualizing algebraic formulas and equations.