wealth
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a group of people or things
Well, honey, first things first, you group the terms with common variables together. So, you have (Ab - ad) + (CD - cb). Then, you factor out the common factors from each group. That gives you A(b - d) + C(D - b). Voila! That's your factored expression.
To find the greatest common factor for any group of numbers you must make a list of all the factors for each number. The factors of 18 are: 1, 2, 3, 6, 9, 18 The factors of 9 are: 1, 3, 9 Therefore, the greatest common factor of 18 and 9 is 9.
The elderly
The factors of 126 are: 1, 2, 3, 6, 7, 9, 14, 18, 21, 42, 63, 126 The factors of 154 are: 1, 2, 7, 11, 14, 22, 77, 154 The common factors are: 1, 2, 7, 14 The Greatest Common Factor: GCF = 14