giải pt: $2x^{2}+2x+1=(2x+3)(\sqrt{x^{2}+x+2}-1)$
giải pt: $2x^{2}+2x+1=(2x+3)(\sqrt{x^{2}+x+2}-1)$
Started By phan xuan y, 28-01-2014 - 17:59
$2x^{2}+2x+1
#2
Posted 28-01-2014 - 19:32
vuvanquya1nct
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DK....
$PT\Leftrightarrow x^2+x+2-(2x+3)\sqrt{x^2+x+2}+x^2+3x+2=0 (*)$
$\Delta =1$
$(*)\Leftrightarrow \begin{bmatrix} \sqrt{x^2+x+2}=x+1 & \\ \sqrt{x^2+x+2}=x+2 & \end{bmatrix}$
Den day thi de rui
Edited by vuvanquya1nct, 28-01-2014 - 20:15.
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