Question 1092355
<br>Use the hint they gave you....  If 
{{{(a+2b)^3 = a^3 + 8b^3 + 6ab(a+2b)}}}  then the expression you are to evaluate is
{{{a^3 + 8b^3 = (a+2b)^3 - 6ab(a+2b)}}}<br>
You are given the values of both (a+2b) and (ab) -- plug them into that equation and evaluate.