<PRE><B>Question 137627</B>
2 out side square root of 72 subtracted by 5 out side square root of 50
:
{{{2*sqrt(72)}}} - {{{5*sqrt(50)}}}
:
Factor to reveal perfect squares in both expressions
{{{2*sqrt(36*2)}}} - {{{5*sqrt(25*2)}}}
:
Extract the square roots of the perfect squares
{{{2*6*sqrt(2)}}} - {{{5*5*sqrt(2)}}}
:
{{{12*sqrt(2)}}} - {{{25*sqrt(2)}}}
:
These are like terms, just do the math
{{{-13*sqrt(2)}}}</PRE>