If a+b+c =6 and a^2+b^2+c^2=20 ,find ab+bc +ca
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Answered by
16
Answer:
(a+b+c)2 = a2+b2+c2 +2( ab+bc+ca)
36 - 20 = 2( ab+ bc+ ca)
16/2 = ab+ bc + ca
8 = ab + bc + ca
Answered by
6
Answer:
ab
+bc
+ca
=5
Step-by-step explanation:
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