Question 330508
{{{(7x+7)(4x^2+8x+4)=7x(4x^2+8x+4)+7(4x^2+8x+4)}}}
{{{(7x+7)(4x^2+8x+4)=(28x^3+56x^2+28x)+(28x^2+56x+28)}}}
{{{(7x+7)(4x^2+8x+4)=28x^3+84x^2+84x+28}}}