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Có tài liệu nhưng gửi lp mấy đây?

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Ta có:

4x² = 3 + y²

\(\Leftrightarrow\) (2x)² - y² = 3

\(\Leftrightarrow\) (2x - y)(2x + y) = 3

....

......

\(\left(x+\dfrac{1}{2}\right)^2=\dfrac{4}{25}\Rightarrow x+\dfrac{1}{2}=\mp\dfrac{2}{5}\Rightarrow x\in\left\{\dfrac{1}{10};-\dfrac{9}{10}\right\}\)