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

Answer:

The correct option is C.

Step-by-step explanation:

The given expression is

$21x-18x+28xy$

The factors of each term are

$21x=3\times 7\times x$

$18x=3\times 6\times x$

$28xy=2\times 2\times 7\times x\times y$

The common factor is x.

$G.C.F.=x$

Therefore correct option is C.