Question

4x² -8=0

Answer 1

\(4x^2-8=0\)

\(\Rightarrow4\left(x^2-2\right)=0\Rightarrow x^2=2\)

\(\Rightarrow x=\pm\sqrt{2}\)

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Answer 2

\(4x^2-8=0\Leftrightarrow4x^2=8\Leftrightarrow x^2=2\Leftrightarrow x=\pm2\) vậy \(x=\pm2\)