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OpenStudy (anonymous):
Given a + b + c = 5 and a² + b² + c² = 9, find the value of ab + ac + bc
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OpenStudy (anonymous):
ab+ac+bc=8
OpenStudy (anonymous):
procedure: \[(a+b+c)^2=a^2+b^2+c^2+2(ab+ac+bc)\] \[5^2=9+2(ab+ac+bc)\] \[ab+ac+bc=8\]
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