lim x → 16 (x-5√x +4)/(x-16)

(x - 5√x + 4)/(x - 16)
= ((√x - 4)(√x - 1))/((√x - 4)(√x + 4))
= (√x - 1)/(√x + 4)
= (√16 - 1)/(√16 + 4)
= (4 - 1)/(4 + 4)
= ⅜