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21 April, 16:24
Ln (1/e^2) without calculator
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Jovan Barron
21 April, 17:30
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Once you remember the definition of a log, the answer to this question will literally fall out of your pencil.
First, ' Ln ' means 'natural log' ... logs to the base of ' e '.
Definition of the natural log of a number:
In order to get the number, what power do I have to raise ' e ' to?
OK. What power do you have to raise ' e ' to in order to get 1/e²?
Isn't 1/e² the same thing as e⁻²?
So, in order to get 1/e², you have to raise ' e ' to the - 2 power.
In math-speak: Ln (1/e²) = - 2.
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Paris
21 April, 17:59
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Ln 1/e²
= Ln 1 - Ln e² as Ln X/Y = Ln X - Ln Y
= 0 - 2 Ln e as Ln 1 = 0 and Ln X² = 2 Ln X
= - 2 * 1 as Ln e = 1
= - 2
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