Question

Dado o limite indeterminado:
lim-x.20
x2 - 400
X - 20
Resolva e assinale a alternativa que traz a solução desse limite indeterminado.​

Answer 1

$\displaystyle\mathsf{\lim_{x \to 20}\dfrac{x^{2}-400}{x-20}}\\\displaystyle\mathsf{\lim_{x \to 20}\dfrac{\cancel{(x-20)}(x+20)}{\cancel{x-20}}} \\\boxed{\boxed{ \mathsf{ = 20 + 20 = 40}}}$