The GCF of
[tex]7x+35[/tex]is 7, so the factored expression is:
[tex]7(x+5)[/tex]The GCF of:
[tex]3x-27=3(x-9)[/tex]is 3
The third expression doesn't have a common factor. 7 and 3 are not a multiple of the other, so this expression cannot be factored.
The GCF of the last one is:
[tex]7x+21=7(x+3)[/tex]is 7.
The third expression is the one that doesn't belong with the other three, because that one cannot be factored.
