Răspunsuri

2014-06-11T22:47:43+03:00
Observam ca x este factor comun.
Il extragem si obtinem, x (  x^{2} - 7x + 12).
Calculam \Delta = 7^{2} - 4 * 12 * 1 = 1 .
Calculam x _{1} =  \frac{7 + 1}{2} = 4  si x _{2} =  \frac{7 - 1}{2} = 3  .
Deci, putem descompune in x(x-4)(x-3).
1 4 1
2014-06-11T22:48:21+03:00
X^3-7x^2+12x=x(x^2-7x+12)=x(x^2-3x-4x+12)=x[x(x-3)-4(x-3)]=x(x-3)(x-4)