"Perfect square" means that you square a whole number. Sometimes simply called "square" or "square number". "Difference of two squares" is the result of subtracting one such square from another. In most cases, the difference will not itself be a square.
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The smallest perfect squares that end with 9 are 9 (the square of 3) 49 (the square of 7). Their difference is 40.
In Algebra, perfect squares are used when one wants to break down a geometrically square object into smaller squares which can be of all different sizes.
Each has two binomial factors.
No. Convention defines perfect squares as squares of positive integers.
No- the closest perfect squares are 36 (perfect square of 6) and 49 (perfect square of 7)