Answer:
[tex]2a[/tex]
Step-by-step explanation:
We are asked to find GCF of [tex]18a[/tex] and [tex]20ab[/tex].
We can see that GCF of [tex]a\text{ and }ab\text{ is }a[/tex].
Let us find greatest common factor of 18 and 20.
Factors of 20: 1, 2, 4, 5, 10, 20
Factors of 18: 1, 2, 3, 6, 9, 18.
We can see that GCF of 20 and 18 is 2.
Upon combining GCF of numerical part and variable part we will get: [tex]2a[/tex]
Therefore, the greatest common factor of both expression is [tex]2a[/tex].
