Question

ache: lim f(x)-f(2)/x-2 qundo x tende a 2: a)f(x)=3x2

Answer 1

$\lim_{x \to 2} \frac{3x^{2}-12}{x-2}$
$= \lim_{x \to 2} \frac{3(x^{2}-4)}{x-2}$
$= \lim_{x \to 2} \frac{3(x-2)(x+2)}{x-2} = 3(x+2) = 12$