Question 983246
<pre>
I still can't tell what you mean.

You say "cube".  But "cube" is "third power"

Do you mean this?:

{{{4sqrt(7)+3sqrt(7)-8^3*7}}}.

If so then 

{{{7sqrt(7)+8*8*8*7}}}

{{{7sqrt(7)+3584}}}

Or did you mean "cube ROOT"  There is a HUGE HUGE difference
between "cube" and "cube root"

If you meant "cube root" then

{{{4sqrt(7)+3sqrt(7)-8root(3,7)}}}

{{{7sqrt(7)-8root(3,7)}}}  

And that's as far as it can be taken.

Edwin</pre>