Question

find the GCF for each one and identify the expression that does not belong with the other three.7x + 353x - 277x + 37x + 21

Answer 1

The GCF of

`7x+35`

is 7, so the factored expression is:

`7(x+5)`

The GCF of:

`3x-27=3(x-9)`

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:

`7x+21=7(x+3)`

is 7.

The third expression is the one that doesn't belong with the other three, because that one cannot be factored.