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July 7, 2015

Homework Help: Math

Posted by Wenny on Saturday, January 26, 2008 at 8:04pm.

What is wrong with the following proof. You must explain your answer in words.
a>3
3a>3(3)
3a-a^2>9-a^2
a(3-a)>(3-a)(3+a)
a>3+a
0>3
the problem with the proof is that the fourth step needs the sign to be reverse...but why?
i looked at step 3 and there is nothing negative to reverse the sigh for...

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