3 ± 5.19615i (to 5 dp) where i is the imaginary sq root of -1
equivalently, 3 ± sqrt(-27) = 3[1 ± sqrt(-3)]
It is: -6 and -6
0
The factor pairs of 36 are (36, 1) (18, 2) (12, 3) (9, 4) (6, 6) None of them add up to 9. If that was -36, you could use 12 and -3
6 and 1
6*6=36
4 and 9
26
24
-22
6*1
-6 and -1.
6 and -1