Question 327041
THis is a difference of two squares.
You factor it like this,
{{{Z^2-A^2=(Z+A)(Z-A)}}}
In this case,
{{{Z^2=25x^2}}}
{{{Z=5x}}}
.
.
{{{A^2=144}}}
{{{A=12}}}
.
.
Substituting,
{{{25x^2-144=(5x+12)(5x-12)}}}