<s>[INST] 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?
 [/INST] Look:
$$5^2x^3-x^5=x^3(5^2-x^2)=x^3(5-x)(5+x)x^3(-1)(x-5)(x+5)=-x^3(x-5)(x+5).$$
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