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January 27th, 2013, 05:09 AM   #1
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solving an easy equation problem >_<

Hello

I have no idea what I'm doing wrong in this simple equation:

Code:
0 = -3^2 - 4 * 2 * x
3^2 = -4 * 2 * x
9 = -4 * 2 * x
9 / (-4 * 2) = x

x = -1.125
x should be 1.125 but I can't figure out what I did wrong.
Any help would be appreciated, thanks!
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January 27th, 2013, 05:20 AM   #2
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I don't see anything wrong in your derivation!

But this is not a number theory problem, you posted it in the wrong section.
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January 27th, 2013, 06:58 AM   #3
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Re: solving an easy equation problem >_<

0 = -3^2 - 4 * 2 * x ; then x = -1.125 ; -3^2 = -9

0 = (-3)^2 - 4 * 2 * x ; then x = 1.125 ; (-3)^2 = 9
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January 28th, 2013, 01:58 PM   #4
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Re: solving an easy equation problem >_<

Quote:
Originally Posted by DannyChu

0 = -3^2 - 4 * 2 * x
3^2 = -4 * 2 * x
-3^2 = -9 since exponentiation has precedence over subtraction.
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