Question 978898
<pre>

{{{(a+b)^3-8b^3}}}  

write that as

{{{(a+b)^3-(2b)^3}}}

You need to know this factorisation:

{{{X^3-Y^3}}}{{{""=""}}}{{{(X^""-Y^"")(X^2+XY+Y^2)}}}

Then substitute {{{(a+b)}}} for {{{X}}} and {{{(2b)}}} for {{{Y}}}
and simplify.

Now you can finish.  If you get stuck, you can tell me in
the thank-you note form below and I'll get back to you.

I do this for fun, not money.  So you don't have to pay.

Edwin</pre>