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Howord braucher
That's the greatest common factor, or GCF.
There is a formula for the difference of two squares. The sum of two squares doesn't factor.
When we say that a number varies by a factor of two from another number, it means that one number is twice the value of the other. Mathematically, if we have two numbers, A and B, and A varies by a factor of two from B, then A = 2B. This relationship indicates that A is double the value of B.
The only proper factor of four is two.