Mister Exam

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n^2

Limit of the function n^2

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The solution

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      2
 lim n 
n->oo  
$$\lim_{n \to \infty} n^{2}$$
Limit(n^2, n, oo, dir='-')
Detail solution
Let's take the limit
$$\lim_{n \to \infty} n^{2}$$
Let's divide numerator and denominator by n^2:
$$\lim_{n \to \infty} n^{2}$$ =
$$\lim_{n \to \infty} \frac{1}{\frac{1}{n^{2}}}$$
Do Replacement
$$u = \frac{1}{n}$$
then
$$\lim_{n \to \infty} \frac{1}{\frac{1}{n^{2}}} = \lim_{u \to 0^+} \frac{1}{u^{2}}$$
=
$$\frac{1}{0} = \infty$$

The final answer:
$$\lim_{n \to \infty} n^{2} = \infty$$
Lopital's rule
There is no sense to apply Lopital's rule to this function since there is no indeterminateness of 0/0 or oo/oo type
The graph
Rapid solution [src]
oo
$$\infty$$
Other limits n→0, -oo, +oo, 1
$$\lim_{n \to \infty} n^{2} = \infty$$
$$\lim_{n \to 0^-} n^{2} = 0$$
More at n→0 from the left
$$\lim_{n \to 0^+} n^{2} = 0$$
More at n→0 from the right
$$\lim_{n \to 1^-} n^{2} = 1$$
More at n→1 from the left
$$\lim_{n \to 1^+} n^{2} = 1$$
More at n→1 from the right
$$\lim_{n \to -\infty} n^{2} = \infty$$
More at n→-oo
The graph
Limit of the function n^2