Question

giúp em câu d với e ạaa

Answer 1

d: \(\Leftrightarrow\sqrt{25x^2+4}=3x-2\)

\(\Leftrightarrow\left\{{}\begin{matrix}x>=\dfrac{2}{3}\\25x^2+4=9x^2-12x+4\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x>=\dfrac{2}{3}\\16x^2+12x=0\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}x>=\dfrac{2}{3}\\4x\left(4x+3\right)=0\end{matrix}\right.\Leftrightarrow x\in\varnothing\)