Question

How do you find the GCF of `21ab, 35a, 56ab^3`?

Answer 1

`7a`

Explanation:

`21 ab, 35 a, 56 ab^3`

divided by `a`
`21 b, 35, 56 b^3`

divided by `7`
`3 b, 5, 8 b^3`

since no more can be divided to the above expressions or number,
therefore it GCF is `a*7 = 7a`