InterviewSolution
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InterviewSolution
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If a+b+c=0 and a²+b²+c²Find value ofab +bc+ca |
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Answer» :(a +b+c) ^2 = a^2+b^2+c^2 + 2ab+2bc+2ac_______________________________putting the values of a+b+c and a^2+b^2+c^2 in the GIVEN formula to get 0 = 16 + 2 (ab+bc+ac) -16 = 2(ab+bc+ac) -16/2 = ab+bc+ac-8 = ab+bc+acHence, the value of ab+bc+ac = -8________________________________(Note : The value of a^2+b^2+c^2 =16, as TOLD by the QUESTIONER) |
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