Edited by tramyvodoi, 26-01-2013 - 14:23.
$2x^{4}- x^{3}+1 =0$
Started By rongtuongduong91, 26-01-2013 - 13:10
#1
Posted 26-01-2013 - 13:10
#2
Posted 26-01-2013 - 13:27
$\Leftrightarrow (x^{4}-2x^{3}+x^{2})+3x^{4}-x^{2}+2=x^{2}(x+1)^{2}+2x^{4}+(x^{2}-\frac{1}{2})^{2}+\frac{7}{4}> 0$giải phương trình $2x^{4}- x^{3}+1 =0$
$\Rightarrow$ PT vô nghiệm.
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