-17
9
They are: 9 times 9 = 81
The two numbers in question are 1 and 9. 1 is equal to 1 squared, and 9 is equal to 3 squared.
9 and 36
2+3+4=9
34 and 9
9 + 9 = 18
There are infinite numbers, but 11* 9 is fine.
Not sure about 720 but if the answer were to be 72 then the two numbers are 8 and 9 8 x 9 = 72 8 + 9 = 17
-17
9
They are: 9 times 9 = 81
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)
42
The two numbers in question are 1 and 9. 1 is equal to 1 squared, and 9 is equal to 3 squared.
-3, -6