There are no two real numbers that will add to -9 and multiply to 81.
Using complex numbers, the two numbers are:
(-9/2 + i9/2√3) and (-9/2 - i9/2√3)
-30
17
-936
-62 and 70
16 and -3 are the numbers which gives -48 when multiplied and 13 when added
20
-17
-30
-127
17
-936
-117
-21, 27
22
137
-43
-71