Math
posted by luis .
x^2 + 9x + 20 over x^2 25 divided by x +4 over x  4
How to do this really confusing i need to simplify the rational expression

I read that as
(x2+9x+20)/(x^225) ÷ (x+4)/(x4)
= (x+4)(x+5)/((x+5)(x5)) ( x4)/(x+4)
= (x4)/(x5) , x ≠ ±5,±4
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