Respuesta :

[tex]\bf \begin{cases} x=3\implies &x-3=0\\ x=-4\implies &x+4=0\\ x=7\implies &x-7=0 \end{cases} \\\\\\ (x-3)(x+4)(x-7)=\stackrel{y}{0}\implies \stackrel{FOIL}{(x^2+x-12)}(x-7)=y \\\\\\ x^3+x^2-12x-7x^2-7x+84=y\implies x^3-6x^2-19x+84=y[/tex]