if a+b+c=6 and a^2+b^2+c^2=20 then find the Vally of ab+bc+ca needed solution
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use the formula
(a+b+c)^2=a^2+b^2+c^2+2(ab+bc+ca)
put the given values
36=20+2(ab+bc+ca)
ab +bc +ca=8
(a+b+c)^2=a^2+b^2+c^2+2(ab+bc+ca)
put the given values
36=20+2(ab+bc+ca)
ab +bc +ca=8
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