Bài 2:
a: \(\Leftrightarrow x^2+2x-x^2=0\)
=>2x=0
hay x=0
b: \(\Leftrightarrow\left[{}\begin{matrix}x=-5\\x=2\end{matrix}\right.\)
c: \(\Leftrightarrow\left(x+3\right)\left(x-5\right)=0\)
hay \(x\in\left\{-3;5\right\}\)
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