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0.5*[-3 - i*sqrt(39)] = -1.5 - 3.1225*i
and
0.5*[-3 + i*sqrt(39)] = -1.5 + 3.1225*i
where i is the imaginary square root of -1
-0.5625
The numbers are 10 and 5.2
41x2=82
4 - 4.898979*i and 4 + 4.898979*i (to 6 dp) where i is the imaginary square root of -1.
The two numbers that have a product of -240 and a sum of 1 are 16 and -15. This is because 16 multiplied by -15 equals -240, and 16 added to -15 equals 1. These two numbers satisfy both conditions simultaneously.