Question 1110934
.
<pre>
The problem says 


{{{(2x)^2}}} - {{{x^2}}} = 1875  sq. inches,


4x^2 - x^2 = 1875


3x^2 = 1875


x^2 = {{{1875/3}}} = 625  ====>  x = {{{sqrt(625)}}} = 25 inches <U>answer</U>.
</pre>