x → ∞ lim 3 x − 2 + 3 2 x − 3 2 x + 3 3 x + 5 5 x
The limit above has a closed form. Find the value of this closed form to 3 decimal places.
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I did it exactly the same way as yours. +1
The approximation of 3 ≈ 1 . 7 is terrible. The decimal answers have a 2% margin of error, so your approximations should be within that range too. Note that we could have calculated it as 3 2 3 , which under your approximation would yield 3 3 . 4 = 1 . 1 3 .
I have removed the approximation from the question. Can you update your answer?
This question is not for level 4 its max for level 2
In the numerator we must neglect
3
3
x
+
5
x
as
2
x
is much much greater compared to it as
x
approaches
∞
.
In the denominator,we must neglect
3
2
x
−
3
as
3
x
−
2
is much much greater compared to it as
x
approaches
∞
.
Now the problem reduces to,
lim
x
→
∞
3
x
−
2
2
x
.
We again can neglect
−
2
in the denominator as much much smaller compared to
3
x
.
So,
lim
x
→
∞
3
x
2
x
=
3
2
=
1
.
1
5
4
.
The approximation of 3 ≈ 1 . 7 is terrible. The decimal answers have a 2% margin of error, so your approximations should be within that range too. Note that we could have calculated it as 3 2 3 , which under your approximation would yield 3 3 . 4 = 1 . 1 3 .
I have removed the approximation from the question. Can you update your answer?
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x → ∞ lim 3 x − 2 + 3 2 x − 3 2 x + 2 3 x + 5 5 x x → ∞ lim 3 − x 2 + 3 x 2 1 2 − x 2 3 3 2 + x 6 1 2 + x 1 0 3 5 ⟹ 3 2 ⟹ 1 . 1 5 4