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Wednesday, March 30, 2011

hw #8-6 Springtime, Love, & Polynomial Unit Tests...

... PERFECT TOGETHER!!

ANSWER KEY FOR PS 8B (Ignore the fact that it's titled "PS 10C"... that's an "old" number)

Chapter 8 Review & Chapter Test
#1 - Infinity

excluding section 8-8 Factoring by Grouping (which is really not too much different than the beautiful symmetry and proportion inherent in the Area Model).

39 comments:

  1. I'll be on pretty late.. So hopefully you answer my questions when they come!

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  2. I'll be checking in early (4-5pm-ish) and late (10pm-ish). I can't imagine there will be any questions... you guys are all rock-solid... I am expecting all 100's on the test!

    GOOD NEWS!!!! We will have the test even if there is a delayed opening!!

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  3. What are the prime factors in the review packet?

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  4. Sorry , my bad. Prime expressions

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  5. You mean prime polynomials!!

    You tell me, then I'll tell you!!!

    (No need for last names, btw!)

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  6. prime polynomial. #10, 14, 15 and 18

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  7. I also just checked the answer key and for #24 i got (4x^2-9y^2) (4x^2+9y^2)

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  8. You factored... but you didn't FULLY FACTOR... can you see why??

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  9. I see. 4 and 9 are perfect squares

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  10. YUP!

    I'll be back later... I expect to see TEAM ALGEBRA helping each other with questions and answers!!!

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  11. If you factor something out, like for example if the problem was 3c(15c^4-21c^2+9), if I were to factor out another 3 would I add it to the 3c or multiply it by 3?

    I think it's multiply..

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  12. I don't really understand #28 on pg 524. Would it be 30?

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  13. ANY ALGEBUDDY WANNA HELP ME?!
    =P

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  14. You can only factor a number out of 2 binomials if it can be pulled out of every monomial, right? So like for example you can't factor n out of this problem (3m+11n)(2m+n)?

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  15. For #71 on pg 526, do you simplify the expression then divide it by 4 to get the length of 1 side?

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  16. I don't know what to do for #75.. Or should I not do that because it is in "factoring by grouping"? But it said factor completely, so..?

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  17. Will there be factoring 4 term polynomials on the test?

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  18. For #23 on the Chapter Test, I'm having a hard time figuring out what to put on the outside of the area model! I'm getting stuck with all the negatives! For the top left & lower right boxes I have -2n & -3n.. And there is no way I can place the negatives to agree with the other boxes, too!

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  19. How do you figure out #25?

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  20. I'm still here... And waiting for 10:00 to come =)

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  21. First, you are not responsible for section 8-8 "Factoring by Grouping" - so breathe a sigh of relief!!

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  22. *Breathes a sigh of relief*

    Okay!

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  23. So no 4-term polynomial solving?

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  24. #28 on 524 is 30, nicely done!

    For 526 #71... THINK THINK THINK!!!

    If a square has an area of 9n^2+54n+81... the only way you can find a "clean" length of a side is if this quadratic polynomial is a perfect square trinomial... so your ONLY HOPE for the first term is 3n and your ONLY HOPE for the last term is 9. Lucky for you,
    (3x+9)^2=9n^2+54n+81
    ... so you're a FACTORING FOOL!!

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  25. No 4-term polynomial factoring on this test... sorry!!

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  26. Ooooh! So it's a perfect square! In those problems, is the only method a little guess 'n' check?

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  27. It's okay!! Trust Me!! =)

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  28. The ChapTest #25 is the SAME ISSUE as #71... can you work it out now?

    Note: Somebody above got area & perimeter mixed up! Mr. or Ms. "divide by 4" at 8:01 pm

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  29. What is guess and check about a perfect square... it either is or isn't. You could have put that one in an AREA MODEL, too. Remember, the AREA MODEL works for all quadratics... remember that GCF!!

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  30. Oh that was me.. (;

    I'll try to figure it out!

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  31. Is #25 (9p+5)^2??

    And oh yeah! Got it!

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  32. ChapTest #21,22,24 are not in play... forget 'em.

    ChapTest #23; factor out the 3n^2 and it should be a fairly-easy-schmeezy area model, right?

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  33. OHHH right! For #23! I did the wrong factors..

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  34. Why are you asking me? How can you figure out if (9p+5)^2 is the right answer.

    Pretend I gave you the problem:
    Simplify (9p+5)^2... what would you do??

    You would multiply (9p+5)(9p+5) and get 81p^2+90p+25... that's what you would do, right??

    So, did you get the right answer?? Multiply it back and check it yourself (aka dig the ditch and fill it back in!)

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  35. Is the answer to #23 (n+3)(2n-1)??

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  36. I filled it back in! And I'm thinking YEP!

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  37. Thanks for the help! I'll try to do some of Problem Set 8B in the morning =) Good night!

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  38. #23... you factored out the 3n^2 but you forgot to include it in your fully factored answer... I told you that you would get that wrong on the test!!

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  39. BUT... I Didn't get it wrong! =D

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