It is 7*(12 + 4).
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It is 7*(1 + 2).
2(1 + 5)
One place where this is used is to simplify fractions: you need to find the greatest common factor, then divide top and bottom by this greatest common factor.Also, in factoring expressions - you can take out the greatest common factor. For example (using "^" for power): 5x^2 + 10x has the greatest common factor 5x; so this can be taken out as a common factor, resulting in 5x(x + 2).
The GCF is 2. The LCF is 1. The difference is 1.
The GCF is 3. No exponents needed.