Răspuns :
[tex](x - 3 ) ( 3 x + 1 ) = 0(X-3)(3X+1)=0
- x - 3 ) ( 3 x + 1 ) = 0(X-3)(3X+1)=0 \\ x = 3 \\ x = - \frac{1}{3} \\ 3x + 1 = 0 \\ x = 3 \: si - \frac{1}{3}
- (x - 3 ) ( 3 x + 1 ) = 0(X-3)(3X+1)=0 \\ x = 3 \\ x = - \frac{1}{3} \\ 3x + 1 = 0 \\ x = 3 \: si - \frac{1}{3} [/tex]
- Succes:))
a=3, b=8, c=-3
Δ=b²-4ac=8²-4*3*(-3)=64+36=100
x1=(-b+√Δ)/2a=(-8+10)/(2*3)=2/(2*3)=1/3
x2=(-b-√Δ)/2a=(-8-10)/(2*3)=-18/(2*3)=-18/6=-3∈Z
S={-3}