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There are no 2 real numbers that do, but the two complex numbers: (3/2 + (i√23)/2) and (3/2 - (i√23)/2) work.
-8+2=-6, but -8•2=-16
Cubes of numbers are made by multiplying a number by itself three times.
-3 and -1 (-3) + (-1) = -4 (-3) x (-1) = 3
add them all together and then divide the answer by the number of numbers.
That is the way that it comes out.