Bài 4
a, \(\left|2x+3\right|=5\Leftrightarrow\left[{}\begin{matrix}2x+3=5\\2x+3=-5\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=1\\x=-4\end{matrix}\right.\)
b, \(\sqrt{\left(2x+3\right)^2}=5\Leftrightarrow\left|2x+3\right|=5\Leftrightarrow\left[{}\begin{matrix}x=1\\x=-4\end{matrix}\right.\)
c, x >= 2
\(3\sqrt{x-2}-2\sqrt{x-2}+3\sqrt{x-2}=40\Leftrightarrow4\sqrt{x-2}=40\Leftrightarrow x=102\left(tm\right)\)
d, \(5x+6=9\Leftrightarrow x=\dfrac{3}{5}\)
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