Question

ma ajutati si pe mine va rog....
3x la a doua -2x-1=0

Answer 1

3x^2-2x-1=0; 3x^2+x-3x-1=0; x(3x+1)-(3x+1)=0; (3x+1)(x-1)=0; x=-1/3; x=1; S={-1/3;1}