Although the question does not say so, it is assumed the answer is two numbers that meet the requirements.
So, if the numbers are a and b, then ab = 7 and a+b = -6
From the second, b = -a-6 so from the first, a*(-a-6) = 7
or -a2 - 6a = 7 or a2 + 6a + 7 = 0
This has the solutions -3 +/- sqrt(2) and these are the two number required.
12
15
6 and -1
-4 and -2
78
22
15
The numbers are: 20 and -6
9
50
The numbers that add up to negative 6 and multiply to negative 27 are -3 and 9.
11