Question 106208
<pre><font size = 6 face = "book antiqua"><b> 
8x² - 200y²

Factor out 8

8(x² - 25y²)

Now the expression in the parentheses
is the difference of two squares:
x² is the square of x
25y² is the square of 5y

So the final factorization is

8(x - 5y)(x + 5y)

Edwin</pre>