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a^2+b^2=178
(a+b)^2=(a^2+b^2)+2ab
256=178+2ab
-2ab=178-256
ab=78
(a-b)^2=(a+b)^2-4ab
(a-b)^2=256-2(2ab)
(a-b)^2=256-2(78)
(a-b)^2=100
a-b=V100=10
x = 13
y =3
Maka selisih = x-y = 13-3 = 10