[Toán 9] $( x^2 - 4 )(x^2 - 2x ) = 2$

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hate.math01

[tex]( x^2 - 4 )( x^2 - 2x ) = 2[/tex]
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Làm lụi :-?
[TEX] (x^2-4)(x^2-2x) \rightarrow (1) (x-2)(x+2)=2 \rightarrow x=0 ,x=4 (2) \rightarrow x^2-2x= x^2-2x.1+1-1 =2 \Leftrightarrow (x-1)^2 -1 =2 \rightarrow (x-1)^2=3 \rightarrow x=4 [/TEX]
 
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