Answer:
1 x (27a^2+72a+28) or 1(27a^2+72a+28)
Explanation:
First find the GCF (greatest common factor) of 27a squared 72a and 28. It is 1 because there is nothing else that can go in.
So put 1 outside the parentheses and keep the terms
1 x (27a^2+72a+28)