If a + b + c = 14 and a? + b2 + c2 = 96,then (ab + bc+ ca)= ? – InterviewSolution

InterviewSolution

1.	If a + b + c = 14 and a? + b2 + c2 = 96,then (ab + bc+ ca)= ?
Answer» (a+b+c)^2=a^2+b^2+c^2+2(ab+BC+CA)14^2=96+2(ab+bc+CA)196-96=2(ab+bc+ac)100/2=ab+bc+acab+bc+ac=50hence it will be 50

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