Jawabanmu

2014-04-28T14:36:47+07:00
A+b=16 <=> (a+b)^2=256
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


2014-04-28T14:51:30+07:00
Cara Logika

x = 13
y =3

Maka selisih = x-y = 13-3 = 10