lim x→-5 :x²+2x-15 per x+5

lim ((x^2+2x-15)/(×+5))
x-->-5
= lim ((x-3)(x+5)/(x+5)) ---->coret (x+5)
x-->-5
= x - 3
= -5 - 3
= -8

            x² + 2x - 15      (x - 3) (x + 5)
lim x = ----------------- = -------------------  = ( x - 3)
                  x + 5              (x + 5)

lim x = x - 3
- 5    = x - 3
        = - 5 - 3
        = - 8