<PRE><B>Question 552883</B>
{{{(-5x+4)(4x^2+x)}}} Start with the given expression.



{{{-5x(4x^2+x)+4(4x^2+x)}}} Expand.



{{{(-5x)*(4x^2)+(-5x)*(x)+(4)*(4x^2)+(4)*(x)}}} Distribute.



{{{-20*x^3-5*x^2+16*x^2+4*x}}} Multiply.



{{{-20*x^3+11*x^2+4*x}}} Now combine like terms.



 So {{{(-5x+4)(4x^2+x)}}} expands to {{{-20*x^3+11*x^2+4*x}}}.



In other words, {{{(-5x+4)(4x^2+x)=-20*x^3+11*x^2+4*x}}}.</PRE>