-6xkuadrat + 22x - 20 per 9xkuadrat - 25 =

[tex] \frac{-6 x^{2} + 22x - 20}{9 x^{2} -25} = \frac{ 3 x^{2} -11x+10}{(3x -5)(3x+5) } = \frac{(3x-5)(x-2) }{(3x-5)(3x+5)} = \frac{x-2}{3x+5} [/tex]