[tex]E(x)=x^3-7x^2-12x=x(\underbrace{x^2-7x-12})=...\;;\\
\Delta=(-7)^2-4\cdot1\cdot(-12)=97\;;\\
x_{1;2}=\frac{7\pm\sqrt{97}}{2}\;\;adica:\;x_1=\frac{7+\sqrt{97}}{2}\;si\;x_2=\frac{7-\sqrt{97}}{2}\\
\Rightarrow\;\;E(x)=...=x(x-x_1)(x-x_2) = .....[/tex]
Sper că finalizarea o poți face !
