That factors to (b + 3)(a + c)
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The GCF is b.
The GCF is b.
The answer depends on whether or not a is a factor of c.
The least common multiple (LCM) of two numbers is the smallest number that is a multiple of both numbers. In this case, the LCM of ab and bc would be the product of the two numbers divided by their greatest common divisor (GCD), which is b. Therefore, the LCM of ab and bc is abc.
That will depend on what type of quadrilateral it is and other information such as its area.