Answers

2014-05-21T11:14:33+05:30
X^ [ x cube] -4.172 i think i am correct

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2014-05-21T11:16:14+05:30
=x^2+2 \sqrt{2}x-6 

now 
6=3* \sqrt{2} * \sqrt{2}
and also
3 \sqrt{2}- \sqrt{2}=2 \sqrt{2}
so
x^2+3 \sqrt{2}x - \sqrt{2}x  +6
x(x-3 \sqrt{2}) - \sqrt{2} (x-3 \sqrt{2})
(x-3 \sqrt{2} ) (x- \sqrt{2})
so
x=3 \sqrt{2}           or           x= \sqrt{2}
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