My Math Forum Prove that... ((PLS HELP))

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 October 6th, 2007, 03:43 PM #1 Newbie   Joined: Oct 2007 Posts: 3 Thanks: 0 Prove that... ((PLS HELP)) Hi there, please, can someone help me to prove this inequality? "Prove that: (ab+ac+bc-1)²>or=(a²+1)(b²+1)(c²+1) for every real numbers a, b and c." Thanks in advance.
 October 7th, 2007, 06:26 PM #2 Global Moderator   Joined: Dec 2006 Posts: 20,927 Thanks: 2205 (aÂ² + 1)(bÂ² + 1)(cÂ² + 1) = (ab + ac + bc - 1)Â² + (a + b + c - abc)Â², as someone else pointed out on the other forum where you posted this problem. Last edited by skipjack; August 9th, 2019 at 08:26 AM.
October 8th, 2007, 06:48 AM   #3
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 ...as someone else pointed out on the other forum where you posted this problem.
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