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[tex]x*(x-3)=4[/tex]

Răspuns :

[tex] x^{2} -3x=4 \\ \\ x^{2} -3x-4 =0 \\ \\ x^{2} -4x+x -4 =0 \\ \\ x(x+1) -4(x+1) =0 \\ \\( x-4)(x+1)=0 \\ \\ x-4 =0 =\ \textgreater \ x=4 \\ \\ x+1=0=\ \textgreater \ x=-1[/tex]