Melody

Here is an interactive drawing of it.  

How have you tried to tackle this guest?

For    \(0

\(\frac{(x-k)^2}{4}+\frac{y^2}{1}=1\qquad and \qquad \frac{(x+k)^2}{4}+\frac{y^2}{1}=1\)

What are the centres of each of these ellipses?

What can you say about these two ellipses?  What is the same and what is different?

So if you draw both of them on the same graph, what line will they have to cross on?

What is the length of the semi-major axis for each.

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What are the properties of a square?  Which might be the most helpful?

Sketch what I have talked about so far.  See what you can work out for yourself.

I would like you to interact with me. Tell me what you have done and ask questions.

The next step is yours.

This will help though.

How many ways are there to give 9 posters to 2 friends.

Poster 1 can go to Aor B   2 ways

Poster 2  can go to A or B 2 ways

..

Poster 9 can go to A or B 2 ways

2^9 in total

How many ways are there to divide a group of 6 friends among the basketball team, the soccer team, and the track team? (Each team could have anywhere from 0 to 6 of the friends on it. Assume the friends are distinguishable.)

It is very easy to double count in these questions so do not assume mine is fully correct.

I think you have it!  Good work!

For any quadratic  \(ax^2+bx+c\)

\(\text{if the roots are } \alpha \text{ and } \beta \)

then

\(\alpha+\beta = \frac{-b}{a}\)

and

\(\alpha\beta = \frac{c}{a}\)

So in this case the roots multiply to 2008/1 =2008

Since you do not understand you will need to ask Textot to explain.

thanks for your response jxc.     

jxc, please explain to us how Textot got his answer.   Explain the reasoning behind it.

If you do not know then ask Textot questions about it.

Encourage or even push him/her to guide you through it.

You responded only after I complained on other posts, \

You posted this question afterwards.

Please respond to my question.