if a+b+c =6 and a^2+b^2+c^2 =14 then find ab+bc+ca
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Answer:11
Step-by-step explanation:
Use (a+b+c)^2 formula
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Answered by
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Answer: ab+bc+ca=11
Step-by-step explanation:
a+b+c=6
a^2+b^2+c^2=14
using (a+b+c)^2:
(a+b+c)^2=a^2+b^2+c^2+2(ab+bc+ca)
6^2=14+2(ab+bc+ca)
22=2(ab+bc+ca)
22/2=ab+bc+ca
ab+bc+ca=11
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