Is $5^2x^3-x^5 = x^3(x-5)(x+5)$ or $-x^3(5-x)(5+x)$ Geogebra's Factor function says that 
$5^2x^3-x^5$ 
is 
$-x^3(x-5)(x+5)$ 
but from what I do, it is positive, $x^3(5+x)(5-x)$
Note the x isnt in the same position
Am I wrong?

No, you're not wrong (but the title doesn't reflect the question):
$$
5^2x^3-x^5=x^3(5^2-x^2)=x^3(5-x)(5+x)
$$
You can use $5-x=-(x-5)$ to rewrite it as
$$
-x^3(x-5)(x+5)
$$
