Question 262842
<pre>
Simplify:

(sqrt(50) - 2sqrt(5))(5sqrt(2) + sqrt(20))

The many calculations by the other person are TOTALLY UNNECESSARY!! 

{{{(sqrt(50) - 2sqrt(5))(5sqrt(2) + sqrt(20))}}}
{{{2sqrt(5)}}} = {{{sqrt(20)}}}
{{{5sqrt(2)}}} = {{{sqrt(50)}}}

So, {{{(sqrt(50) - 2sqrt(5))(5sqrt(2) + sqrt(20))}}} 
    {{{(sqrt(50) - sqrt(20))(sqrt(50) + sqrt(20))}}} 
    {{{sqrt(50)^2 - sqrt(20)^2}}} = <font color = red><font size = 4><b>50 - 20 = 30</font></font></b></pre>