If ab+bc+ca=36 and a 2 +b 2 +c 2 = 85, find a+b+c. pls tell me....
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We know that
(a+b+c)^2=a^2+b^2+c^2+2(ab+bc+ac)
or (a+b+c)^2=85+2*36
or (a+b+c)^2=85+72
or (a+b+c)=(157)^1/2
(a+b+c)^2=a^2+b^2+c^2+2(ab+bc+ac)
or (a+b+c)^2=85+2*36
or (a+b+c)^2=85+72
or (a+b+c)=(157)^1/2
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