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October 6th, 2007, 03:43 PM   #1
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Prove that... ((PLS HELP))

Hi there, please, can someone help me to prove this inequality?

"Prove that: (ab+ac+bc-1)>or=(a+1)(b+1)(c+1) for every real numbers a, b and c."

Thanks in advance.
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October 7th, 2007, 06:26 PM   #2
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(a + 1)(b + 1)(c + 1) = (ab + ac + bc - 1) + (a + b + c - abc), as someone else pointed out on the other forum where you posted this problem.
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October 8th, 2007, 06:48 AM   #3
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Quote:
...as someone else pointed out on the other forum where you posted this problem.
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