Giải phương trình

E

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XKXĐ: $x \ge 0$

PT \Leftrightarrow $2x+9+2\sqrt{x(x+9)}=2x+5+2\sqrt{(x+1)(x+4)}$

\Leftrightarrow $2+\sqrt{x(x+9)}=\sqrt{(x+1)(x+4)}$

\Leftrightarrow $4+x^2+9x+4\sqrt{x(x+9)}=x^2+5x+4$

\Leftrightarrow $x+\sqrt{x(x+9)}=0$

\Leftrightarrow $x=0$
 
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