4a
The GCF is 4a. The equation factors into 4a(5a + 9)
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)
(2a + 10)(2a - 12)
Since 2 is a factor of 4a and the largest factor of 2 is 2, and thus the greatest common factor cannot be larger than 2, the greatest common factor is 2.
4a
4A
The greatest common factor of 16 20 and 36 is 4.
The GCF is 4a. The equation factors into 4a(5a + 9)
4a
The GCF is 4a
4(a+5b)
The GCF is 4a^2
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.
a2 - 4a + 4
It is: (a+1)(a+3) when factored