Question

limx→4 ((x-4)/(x2-16))

Answer 1

(x-2)(x+2)/ (x-4)(x+4) -> (x-2)(x+2)/(x-2)(x-2)(x+2)(x+2) cortando os similares
0/(x-2)(x+2)= 0/(4-2)(4+2)= 0/2.6= 0/12= ∞