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The Math-Magic Thread

Discussion in 'The Lounge' started by BFISA, Jul 1, 2006.

  1. BFISA

    BFISA Well-Known Member

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    This is a sampling of the Algebra test I took yesterday-

    2x^2+ 3x-5=0

    This quadratic equation must be solved by factoring.

    My solution follows:

    2x^2-2x+5x-5=0
    2x(x-)+5(x-1)=0
    (x-1)(2x+5)=0
    x-1=0 or 2x+5=0
    x=1 or 2x=-5
    x=-5/2

    So, CCG, Thumper, Trumpie, anya y'all math gurus, tell me if I did wrong!!:)
     
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  2. WonderSlug

    WonderSlug New Member

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    2x^2+3x-5=0 ==> (2x+5)(x-1)=0

    Yeah, X=1 or X= - 5/2
     
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  3. Trumpet_Man

    Trumpet_Man New Member

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    That is what I get as well.....damn it has been 25 years plus seeing that stuff. :tup:
     
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  4. BFISA

    BFISA Well-Known Member

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    Ok, the next one must be solved by completing the square.

    3x^2+12x=3

    My solution-

    Divide both sides by 3, which leaves
    x^2+4x=1
    1/2 of the numerical coefficient=2, added to both sides, which leaves
    x^2+4x+2=1+2
    (x+2)^2=3
    x+2=+/-the square root of 3
    x=-2+/-the square root of 3
     
  5. BFISA

    BFISA Well-Known Member

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    Hang with me, Bro, I'm gonna post the whole friggen test and and my solutions to the probs, right or wrong!!
     
  6. BFISA

    BFISA Well-Known Member

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    The next equation must be solved by the square root method-

    4x^2+7=0

    My solution-

    4x^2=-7
    2x=the square root of 7
    x=+/- i times the square root of 7 divided by 2, where i = the square root of -7
     
  7. KimPossible

    KimPossible BoltTalker

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    I'm telling your teacher!!!! :icon_wink:
     
  8. BFISA

    BFISA Well-Known Member

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    He'll give me the results on Monday...I'm jes alittle antsy and thot I'd axt the math geeks here what they think of my solutions!!:) :icon_mrgreen:
     
  9. BFISA

    BFISA Well-Known Member

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    Right now, I'm lookin for some software to graphically display "plus or minus the square root of 7", cuz the next problem deals wit the Quadratic Equadratic Formula.
     
  10. KimPossible

    KimPossible BoltTalker

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    I'm teasing....:icon_mrgreen: And I'm sure you will do fine!
     
  11. BFISA

    BFISA Well-Known Member

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    Thats ok Darlin, I really feel confident about this test.
     
  12. KimPossible

    KimPossible BoltTalker

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    Good! I had the best algebra teacher ever in college...he made it all seem so easy...but now I forgot most of it....:icon_eek:
     
  13. BFISA

    BFISA Well-Known Member

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    Thats kinda how I feel about my instructor...this is actually a remedial course, as I didn't place high enuff on the placement exam to go directly to College Algebra. So I'm havinta start atta lower level...but the good news is, I can have this guy as my instructor all the way thru College Algebra and beyond, so I'm pretty happy about that.

    When I started this endeavor last fall, I believed math was gonna be a sore point, but its actually turned into a strength.
     
  14. Trumpet_Man

    Trumpet_Man New Member

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    I just got back on the net and am into my 7th beer since the last math problem..... :lol:

    I will try :icon_mrgreen:
     
  15. Trumpet_Man

    Trumpet_Man New Member

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    Now I am being commanded to cook the steaks ..... and drink more beer....:icon_mrgreen:
     
  16. BFISA

    BFISA Well-Known Member

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    The next problem must be solved using the Quadratic Formula-

    if ax^2+bx+c=0, then x=-b+/- the square root (tsr) of b^2-4ac divided by 2a.

    3x^2-x-5=0

    My solution-

    a=3, b=-1, c=-5...sooooooo

    -(-1)+/-tsr of -1 x 4(3 x -5) divided by 6
    1+/-tsr of -61 divided by 6
     
  17. BFISA

    BFISA Well-Known Member

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    The rest of the probs can be solving using whatever-

    5x^2-10x=0 I chose to factor this equation

    5x(x-2)=0
    5x=0 or x-2=0
    x=0 or x=2
     
  18. BFISA

    BFISA Well-Known Member

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    Again, I chose to factor this equation-

    3x^3-27=0
    3x(x^2-9)=0
    3x=0 or x^2-9=0
    x=0 or x^2=9
    x=0 or x=3
     
  19. KimPossible

    KimPossible BoltTalker

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    Kudos for all your hard studying...on a Saturday!!! :)

    I'm tired and just staying home today...I just got back from a vacation...why are "vacations" so tiring? Later on I'm going to the sports park to watch a fireworks show.
     
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  20. BFISA

    BFISA Well-Known Member

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    Sounds likea plan, Darlin!!:)

    I can't tellya how many times I've said that I'd be gladta get backta work so I could get some rest from the rigors of "vacation!!":lol: :yes:
     
  21. BFISA

    BFISA Well-Known Member

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    Dammit!! I see a flaw in this!!

    Shoulda been

    3x(x^2-9)=0
    3x(x+3)(x-3)=0
    3x=0 or x+3=0 or x-3=0
    x=0 or x=-3 or x=3

    Crap!!:icon_evil:
     
  22. BFISA

    BFISA Well-Known Member

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    Thats enuff for today!!:icon_evil:
     
  23. KimPossible

    KimPossible BoltTalker

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    Good luck on your math test results!!! :)
     
  24. BFISA

    BFISA Well-Known Member

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    Thanx Darlin...87!

    I'm a little disappointed it wasn't mo bettah...OTOH, I need a 53 on the Finalta get a B, and a 13ta get a C.

    But I'm gonna shoot for 93ta get an A!!:) :yes:
     
  25. KimPossible

    KimPossible BoltTalker

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    87 is pretty good....so close to an A....

    Yep shoot for the 93...you might just do it! At least you know you have the B locked up.

    Watch out for the LITTLE stuff...that's what usually does ya in...the little mistakes...
     
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  26. BFISA

    BFISA Well-Known Member

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    I prolly lost 6 or 7 points on missplaced pos or neg signs and those freakin +/- :icon_sad: :icon_shrug: :icon_huh: :no:
     
  27. KimPossible

    KimPossible BoltTalker

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    I know! :icon_eek: That's what I'm talking about...you can have all the complex formulas completely down and mess up on the stupid multiplication or little things because you're so worried about the BIG stuff you gloss over the little stuff....

    But a B is good and you got that for sure...but you might still get the A...I love As...:)
     
  28. BFISA

    BFISA Well-Known Member

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    Me too, Darlin!!

    Thanx for the encouragement!!:) :tup:
     
  29. KimPossible

    KimPossible BoltTalker

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    lol I just came back on and saw you pop up on this thread!

    You are welcome!!! :icon_mrgreen:

    I think Off Season Madness has taken over both the forums!!!:icon_eek:
     
  30. CCG

    CCG New Member

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    Just be glad it's a test. You mess up the +/- in some of my projects and you'll get some very unwanted results.:lol:
     

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