Answers

2014-07-09T17:58:56+08:00
Tip: on number one, is:
x= -4 plus and minus the square root of 40, over 2.
that's not yet done. 
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2014-07-09T18:33:35+08:00
 the answer in number one is 
1x^{2} +4x-6=0

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