Question

Find the values of the constant k such that the limit exists.
lim (x2 − k2)/(x − 8)
x → 8

Answer 1

(x^2 - k^2) = (x+k) (x-k), so k must be 8

Answer 2

both positive and negative 8?

Answer 3

actually, you're right. K = -8 or 8 will both work

Answer 4

thanks