a)
[tex]3 x^{2} -7x+2=\ \textgreater \ \\ 3 x^{2} -x-6x+2=\ \textgreater \ \\ x(3x-1)-2(3x-1)=\ \textgreater \ \\ (x-2)(3x-1)[/tex]
b)
[tex]3 x^{2} +7x-6=\ \textgreater \ \\ 3 x^{2} +9x-2x-6=\ \textgreater \ \\ 3x(x+3)-2(x+3)=\ \textgreater \ \\ (3x-2)(x+3) \\ Succes[/tex]