The greatest common factor (GCF) is 4.
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4a
The GCF is 4a. The equation factors into 4a(5a + 9)
The greatest common factor (GCF) of 4a and 10a is 2a. To find the GCF, we need to identify the largest factor that both 4a and 10a have in common. In this case, both 4a and 10a can be divided by 2 and a, making 2a the greatest common factor.
I'm not clear on your terminology but I'm pretty sure it would look like this: 4(a-3). In this case 4 is the greatest common factor.
5(4a + 7)