Question

c^2-9c-18
would this be considered as prime or is there a valid answer for this?
helper will be rewarded

Answer 1

yeah It is a prime

Answer 2

To prove that it is prime, list the factors of -18 with opposite sign:
1, -18
2, -9
3, -6
-1, 18
-2, 9
-3, 6
and check to see if any of the pairs add up to -9?

Answer 3

thank you all