[tex]4x^2-12x+8=0=\ \textgreater \ \\
4(x^2-3x+2)=0=\ \textgreater \ \\
4(x^2-x-2x+2)=0=\ \textgreater \ \\
4(x-2)(x-1)=0 =\ \textgreater \ \\
(x-2)(x-1)=0=\ \textgreater \ \\
x-2=0 =\ \textgreater \ \\
x-1=0=\ \textgreater \ \\
x_1=2; \\
x_2=1 \\
S=[1;2] \\
Succes[/tex]