-3x²+17x+6 <0<br>3x²-17x-6 <0<br>D=(-17)²-4*3*(-6)=289+72=361=19² x1=(17+19)/2*3=36/6=6 x2=(17-19)/2*3=-2/6=-1/3 3(x-6)(x+1/3)<0<br> + - + ______________-1/3__________________6______________ x∈(-1/3; 6)