# Thread: exponent error question

1. ## exponent error question

i need to calculate $e^{-0.5}$

why the solution develops $e^{-x}$ and puts 0.5
and not $e^{+x}$ and putting -0.5
?

2. Originally Posted by transgalactic
i need to calculate $e^{-0.5}$

why the solution develops $e^{-x}$ and puts 0.5
and not $e^{+x}$ and putting -0.5
?
Dear transgalactic,

1) You should know that, $a^{-x}=\frac{1}{a^x}$

2) $a^{0.5}=a^{\frac{1}{2}}=\sqrt{a}$

3) Also, $e\approx{2.7182818284591}$

Hope this helps you.

3. developing in taylor series
but in the first we have libnits series and on the other not
so its not the same

why they are not the same?