1. What does it mean to raise a number to sqrt(-1), aka "i"?

2. .

3. why does xi equal eiln(x)? and how do I post those pretty mathematical letters?

4. Have you studied logarithms?

5. I know than ln(x) means eln(x) = x, but don't know how to related xi and eiln(x)

6. You can derive this from the familiar laws of exponents.

You know that , so you just apply that law in the special case that and , to obtain (recall that ).

7. The pretty mathematical letters are , by the way.

LaTeX - Wikipedia, the free encyclopedia

8. Oh, now it just sounds so simple, I don't know why I didn't figure it out! Thx! Also, how do I use this "LaTeX" thingy?

9. You use the $$...$$ tags.

For example, if you write

$$\displaystyle ax^2 + bx + c = 0 \Rightarrow x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}$$

it will render as

Edited to add: You don't really need the \displaystyle bit, it just makes the fraction render more attractively. Without you'd get this:

LaTeX code: $$ax^2 + bx + c = 0 \Rightarrow x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}$$

Rendered output:

10. nice! thx!

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