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The numbers are (1/2)(5 + i root(15)) and (1/2)(5 - i root(15))Note: You can get this from the Wolfram Alpha site, using the input:
a+b=5, ab=10
The numbers are the complex conjugate pair 2.5 +/- 1.9365 i where i is the imaginary square root of -1.
-19
-1
7.5516 and 70.4484 (approx)
49
23
The numbers are: -25 and -30
15.268 and 18.732
4
The numbers are 10 and 5.2
-9+4
2.4115 and 33.5885 (to 4 dp)
8, 5 and 2
The numbers are: 30 and -30