Toán Lớp 9: (4x ² -x) (x ²+3x-4) =0
(x ²+2x) (x ²+x-2)=0
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Toán Lớp 9: (4x ² -x) (x ²+3x-4) =0
(x ²+2x) (x ²+x-2)=0
Comments ( 2 )
<=>x(4x -1) (x^2+4x-x-4) =0
<=>x(4x -1) [x(x+4)-(x+4)] =0
<=>x(4x -1) (x-1)(x+4) =0
<=>\(\left[ \begin{array}{l}x=0\\4x -1=0\\x-1=0\\x+4=0\end{array} \right.\)
<=>\(\left[ \begin{array}{l}x=0\\4x =1\\x=1\\x=-4\end{array} \right.\)
<=>(x^2+2x) (x^2+2x-x-2)=0
<=>x(x+2) [x(x+2)-(x+2)]=0
<=>x(x+2)(x-1)(x+2)=0
<=>x(x+2)^2(x-1)=0
<=>\(\left[ \begin{array}{l}x=0\\x+2=0\\x-1=0\end{array} \right.\)
<=>\(\left[ \begin{array}{l}x=0\\x=-2\\x=1\end{array} \right.\)