Question

x-3 cănx = 0

Answer 1

x-3\(\sqrt{x}\) = 0  (đkxđ:x \(\geq \) 0

<=> \(\sqrt{x}\)(\(\sqrt{x}\) -3) = 0

<=> \(\orbr{\begin{cases}\sqrt{x}=3\\\sqrt{x}=0\end{cases}}\)<=>\(\orbr{\begin{cases}x=9\\x=0\end{cases}}\)