Question

Rezolavati in R ecuatia: 2x² - 4x-6=0

Answer 1

$2 x^{2} -4x-6=\ \textgreater \ 2( x^{2} -3x-3)=0=\ \textgreater \ 2( x^{2} +x-3x-3)=0$$=\ \textgreater \ 2(x(x+1)-3(x+4))=0=\ \textgreater \ 2(x-3)(x+1)=0$$=\ \textgreater \ (x-3)(x+1)=0=\ \textgreater \ x-3=0=\ \textgreater \ x+1=0=\ \textgreater \ x_{1} =3; x_{2}=-1$$S={-1;3}$
$Succes$