Rozwiąż równanie kwadratowe : 12x kwadrat - 13x - 120 = 0

[latex]12x^{2}-13x-120=0 \ Delta=169+4*12*120=5929 \ sqrt{Delta}=77 \ x_{1}= frac{13-77}{24} =- frac{8}{3}=-2 frac{2}{3} \ x_{2}= frac{13+77}{24} = frac{15}{4} =3 frac{3}{4} [/latex]

[latex]12x^2-13x-120=0\ 12x^2+32x-45x-120=0\ 4x(3x+8)-15(3x+8)=0\ (3x+8)(4x-15)=0\ x_1=- frac{8}{3} vee x_2= frac{15}{4} [/latex] ///Khan.