What’s is a, b and c and explain if you can

The greatest common factor is simply which factors of each number are shared between them. Factors are numbers that multiply together to get a certain number.

For example, a) 2x, 4

The factors of 2x are 2 and x

The factors of 4 are 2 and 2

The factors that are shared between them is 2, so the greatest common factor is 2 in this case.

For 2x^2, 4x it's easier to write it out:

The factors of 2x^2 are 2, x, x

The factors of 4x are 2, 2, x

Because they both have 2 and x, the greatest common factor is 2x in this case.