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Vamos a factorar cada polinomio en sus factores primos
x^2 + 6x + 9 = (x+3)^2
x^2 - 5x + 6 = (x - 3)( x - 2)
x^2 - 36 = (x - 6)(x + 6)
Ahora colocamos esos factores en la expresion para simplificar:
[(x+3)^2 / (x -3)(x-2) ] / [(x - 6)(x +6) / (x-2)] = [(x+3)^2 . (x-2)] / [(x-3)(x-2)(x-6)(x+6)] =
(x+3)^2 / [(x-3)(x-6)(x+6)]