Question

lim x → 4 x^2-16/x-4

Answer 1

$lim \: x - > 4 \: \frac{(x + 4)(x - 4)}{x - 4}$
$lim \: x - > 4 \: \: \: \: \: (x + 4) = 8$

Answer 2

lim x- >4 (x+4) (x-4)/x-4
lim x- >4 (x+4) = 8