Question

What is the greatest common factor of the terms in the expression 21x-18x+28xy?

A.3

B.3x

C.x

D.xy

Answer 1

The answer i got was c because the letter x goes into each of them because they each have a x in them. It would be B but 3 doesnt go into 28. 

Answer 2

The correct option is C.

Explanation:

The given expression is

`21x-18x+28xy`

The factors of each term are

`21x=3* 7* x`

`18x=3* 6* x`

`28xy=2* 2* 7* x* y`

The common factor is x.

`G.C.F.=x`

Therefore correct option is C.