Question 853800
<pre>
{{{sqrt(58 + sqrt(31 + sqrt(21 + sqrt(11 + sqrt(25)))))}}}

Since {{{sqrt(25)=5}}} the preceding becomes:

{{{sqrt(58 + sqrt(31 + sqrt(21 + sqrt(11 + 5))))}}}

Since {{{11+5=16}}} the preceding becomes:

{{{sqrt(58 + sqrt(31 + sqrt(21 + sqrt(16))))}}}

Since {{{sqrt(16)=4}}} the preceding becomes:

{{{sqrt(58 + sqrt(31 + sqrt(21 + 4)))}}} 

Since {{{21+4=25}}} the preceding becomes:

{{{sqrt(58 + sqrt(31 + sqrt(25)))}}}

Since {{{sqrt(25)=5}}} the preceding becomes:

{{{sqrt(58 + sqrt(31 + 5))}}}

Since {{{31+5=36}}} the preceding becomes:

{{{sqrt(58 + sqrt(36))}}}

Since {{{sqrt(36)=6}}} the preceding becomes:

{{{sqrt(58 + 6)}}}

Since {{{58+6=64}}} the preceding becomes:

{{{sqrt(64)}}}

Since {{{sqrt(64)=8}}} the preceding becomes:

8

Edwin</pre>