[casio 9] phân tích

H

hien_vuthithanh

$\sqrt[3]{x+a}+\sqrt[3]{x-a}=\sqrt[3]{2x}$

\Leftrightarrow $2x+3\sqrt[3]{x^2-a^2}(\sqrt[3]{x+a}+\sqrt[3]{x-a})=2x$

\Leftrightarrow $3\sqrt[3]{x^2-a^2}(\sqrt[3]{x+a}+\sqrt[3]{x-a})=0$

\Leftrightarrow $\sqrt[3]{x^2-a^2}.\sqrt[3]{2x}=0$

\Leftrightarrow$ \left[\begin{matrix} x=a\\ x=-a\\x=0\end{matrix}\right.$
 
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