Are these both prime? Can they be factored?

Question

y^2-y+156

and

r^2-9r-39

Thank you

Answer 1

well, I need two numbers one apart that multiply to 156
try 12 and 13 :)
(y-13)(y+12)

for 39 they must differ by 9
3 and 13 nope, both prime so no other way ,,, hopeless
too bad it was not r^2-10r -39 :)