Question

Resolva esse exercício de Noções de Limites e Derivadas

Answer 1

$a^2-b^2=(a-b)(a+b)$

$\lim_{x \to 4} \frac{x^2-16}{x-4}\\\\ \lim_{x \to 4} \frac{(x-4)(x+4)}{x-4}\\\\ \lim_{x \to 4} (x+4)\\\\8$

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$\lim_{x \to -3} \frac{x^2-9}{x+3}\\\\ \lim_{x \to -3} \frac{(x-3)(x+3)}{x+3}\\\\ \lim_{x \to -3} (x-3)\\\\-6$