Chapter 2 (Polynomial & Rational Functions)
Oct 3rd, 2010 by corricelli
Let’s use this location to post questions/concerns/information related to Chapter 2!
Looking forward to blogging with you!
Sincerely,
Mrs. Corricelli
93 Responses to “Chapter 2 (Polynomial & Rational Functions)”
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Mariah (and Serena):
Remember that all of the cool “tricks” you used this unit and last unit can help you to get a better feel for where your window will be…
For example, x and y intercepts tell you the parts of these axes you need to see. Asymptotes tell you key lines you will need to see. Holes are important to verify. Finally, remember to look for translations – also shown through the above attributes (asymptotes, intercepts) – these big shifts can cause a graph’s location to change significantly!
I will be checking around 8pm tonight for any further questions.
Keep up the good work!
Thanks,
Mrs. Corricelli
Hi,
I’m doing some problems from the book, and am doing problem 109 on page 208 (chapter 2 review). The 3 zeros are -4, and 2+-3i. I am only getting -4, and then get stuck. I also checked calcchat, entering chapter 2, R for review, and 109 for the problem, and it is a completely different problem on the calcchat website. Maybe I’m doing something wrong with calcchat, I really don’t know. Help please!
Ok;
So if -4 is a zero, then there must be three other zeros (since this is a fourth degree polynomial) or -4 has multiplicity 2. Since the other two are complex there can only be two complex and one other real zero (again it could be -4).
If 2+3i and 2-3i are zeros then (x-(2+3i)) and (x-(2-3i)) are factors. Multiply these through to get this combined factor of the quotient you found when you learned that -4 was a zero. Use long division to divide into the factored quadratic and get the fourth zero.
Did anyone do this?
Can anyone else help?
I am going to need to close off at this point. Haley, if your question is still unresolved tomorrow morning, see me.
I am already meeting with a few students in your class at 7am. All are welcome! I will have detailed solutions to all odd review problems copied for anyone who is interested.
Take care,
Mrs. Corricelli
I’m having trouble with problem 105 on page 208. the question asks to use the given zero, 2+i to find all the zeros of the function 2x^4-3x^3-13x^2+37x-15. what i did was multiply (x+(2+i)) by it’s conjugate, (x+(2-i)) to get x^2+4x+5, which i then used to divide the function using long division. however, i keep getting a remainder no matter how many times i try it.
it might’ve taken me an hour, but i got the problem. you really have to divide by (x-(2+i))(x-(2-i))
@will: this is extremely late, but yeah. you have to remember to SUBTRACT it. For example if 3 is a zero, then x-3 is the factor.
Hi Mrs. Corricelli,
My user name and password on the sheet that you gave us in class aren’t working. It isn’t letting me on to the wiki home page. Should I just request membership with my other user name and password?
Yes. Try it!
Thanks,
Mrs. Corricelli
Can someone please tell me what the homework for tonight is, thanks
@ Sam, hey today, I’m not exactly sure of te hmework myself honestly…but i think it’s just to review Chapter 2 problems so we can ask Questions for our test which is Thursday. Also, be updated with the Wiki, and I’m not sure if I’m missing anything else….
oops the chapter 2 test is actually Friday****
Mrs Corricelli I sent you an email.. because I still can’t get on the wiki!!
oh wait no! i got it!:)
What’s the math homework tonight? Someone told me it was doing all of the odd problems for the chapter review. Is that correct?
Jen,
Yup! You already have all of the solutions worked out for you.
We will close of the lab and have time to answer review questions tomorrow in class before Friday’s Test.
Thanks,
Mrs. Corricelli
I’m working on the lab right now and I got stuck on question number 5 in the extension and reinforcement section of the report. The question is could the CBR ever create a polynomial wiht a y-intercept? Why or why not?
Because the second you hit record on the CBR time is already moving forward does it not record a distance at zero seconds??
Hey Colleen!
That’s what I put. For there to be 0 seconds, the CBR is not recording anything or time has completely stopped (which is impossible). As soon as you press start, time is going by, even if it’s one millionth of a second.
Hope this helps!
Mrs. Corricelli,
Ive made an attempt to email you but maybe you didn’t have time to check. For the wiki because I got swamped with other tests I got started on it late, I understand parts of the problem and want to be able to complete the assignment but the problem has been solved and therefore not only are there no questions to answer, but my questions arent being answered and I do not fully understand how to solve it. What do I do?
Becca,
I have been in training all day.
You could:
Create your own.
Find another way to solve the existing problem.
Take care!
Mrs. Corricelli
What page is the homework on? I forgot to write it down.
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