Question

lim (x^2-81)/(3-√x)
x->0
lim (-1√1-x^2)/(x)
x->0
lim (7x^2+4x)/(2x^3+x^2+3)
x->inf
lim (x^2+6x-16)/(x^2-4)
x->2

Answer 1

(×-9)(×+9)=(√x-3)(√x+3)(×+9)
- lim (√x+3)(×+9) = -27