Which pair of numbers with sum 8 has largest product?

Answer 1

4*4 = 16 (4+4 = 8)

3*5 = 15 (3+5 = 8)

2*6 = 12 (2+6 = 8)

1*7 = 7 (1+7 = 8)

0*8 = 0 (0+8 = 8)

So 4 and 4 produce the largest product and still have the sum of 8.

Assumptions:

only integers,

that this can be extrapolated (-1*9 < 0*8 etc)