Question

( x^2 - 1) ( x-2) = 0

Answer 1

`(x^2 - 1)(x - 2) = 0`

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`<=>` `{(x^2 - 1 = 0),(x - 2 = 0):}`

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`<=>` `{(x = 1),(x = 2):}`

Vậy `x = {1; 2}`

Answer 2

\(=>\left[{}\begin{matrix}x^2-1=0\\x-2=0\end{matrix}\right.=>\left[{}\begin{matrix}x^2=1\\x=2\end{matrix}\right.=>\left[{}\begin{matrix}x=\pm1\\x=2\end{matrix}\right.\)

Answer 3

\(\left(x^2-1\right)\left(x-2\right)=0\)

\(\left(x-2\right)\left(x-1\right)\left(x+1\right)=0\)

\(\Leftrightarrow\left\{{}\begin{matrix}x=1\\x=-1\\x=2\end{matrix}\right.\)