İf a+b+c=6,ab+ac+bc=10,find a2+b2+c2
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a+b+c=6
ab+ac+bc=10
as,
(a+b+c)2=a2+b2+c2+2(ab+bc+ca)
(6)2 =a2+b2+c2+2*(10)
36 =a2+b2+c2+20
36/20 =a2+b2+c2
a2+b2+c2=1.8 (ans)
ab+ac+bc=10
as,
(a+b+c)2=a2+b2+c2+2(ab+bc+ca)
(6)2 =a2+b2+c2+2*(10)
36 =a2+b2+c2+20
36/20 =a2+b2+c2
a2+b2+c2=1.8 (ans)
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