Question 977406
Use the distributive property,
{{{(m+5)(m^2-4)=m(m^2-4)+5(m^2-4)}}}
{{{(m+5)(m^2-4)=m^3-4m+5m^2-20}}}
{{{(m+5)(m^2-4)=highlight(m^3+5m^2-4m-20)}}}