Question 188785
{{{(3+x)(x-4)(x)}}} Start with the given expression.



{{{(3x-12+x^2-4x)(x)}}} FOIL



{{{x(x^2+3x-4x-12)}}} Rearrange the terms.



{{{x(x^2-x-12)}}} Combine like terms.



{{{x^3-x^2-12x}}} Distribute



So {{{(3+x)(x-4)(x)=x^3-x^2-12x}}}