Question

tìm x \(\sqrt{2}\) x-\(\sqrt{50}\)=0

Answer 1

\(x\sqrt{2}-\sqrt{50}=0\)

\(\Leftrightarrow\sqrt{2}\left(x-\sqrt{25}\right)=0\)

\(\Leftrightarrow x=\sqrt{25}\)

Answer 2

\(\sqrt{2}x-\sqrt{50}=0\)

⇔\(x\sqrt{2}-\sqrt{25.2}=0\)

⇔\(\sqrt{2}\left(x-5\right)=0\)

⇔\(\sqrt{2}=0\)(vô lý)

⇔\(x-5=0\)

⇔x=5

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