Mister Exam

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a^2

Limit of the function a^2

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The solution

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

The final answer:
$$\lim_{a \to \infty} a^{2} = \infty$$
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 a→0, -oo, +oo, 1
$$\lim_{a \to \infty} a^{2} = \infty$$
$$\lim_{a \to 0^-} a^{2} = 0$$
More at a→0 from the left
$$\lim_{a \to 0^+} a^{2} = 0$$
More at a→0 from the right
$$\lim_{a \to 1^-} a^{2} = 1$$
More at a→1 from the left
$$\lim_{a \to 1^+} a^{2} = 1$$
More at a→1 from the right
$$\lim_{a \to -\infty} a^{2} = \infty$$
More at a→-oo
The graph
Limit of the function a^2