## Elementary Algebra

$6x^{3}-x^{2}-13x-4$
We will expand the expression by multiplying each term of the first expression by the whole second expression. Then, we will collect similar terms to obtain: $(3x+1)(2x^{2}-x-4)$ =$3x(2x^{2}-x-4)+1(2x^{2}-x-4)$ =$6x^{3}-3x^{2}-12x+2x^{2}-x-4$ =$6x^{3}-3x^{2}+2x^{2}-x-12x-4$ =$6x^{3}-x^{2}-13x-4$