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    algebra/trig2

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    Dark Flame99966
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    Re: algebra/trig2

    Post by Dark Flame99966 on Sun Sep 19, 2010 6:57 pm

    Preid, you wrote the 2nd wrong.

    But it's answer is(2x^2-5)(6x+1)


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    Re: algebra/trig2

    Post by Dark Flame99966 on Sun Sep 19, 2010 6:59 pm

    And the third is
    2x-7|<9
    x= 8 or -1


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    Re: algebra/trig2

    Post by preid1220 on Sun Sep 19, 2010 7:01 pm

    i did not wright it wrong, i gave you what i was given.


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    Re: algebra/trig2

    Post by Ahmed on Sun Sep 19, 2010 7:03 pm

    I already did the third, flame: 0 is less than or equal to x. x is less than or equal to 4.


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    Re: algebra/trig2

    Post by Dark Flame99966 on Sun Sep 19, 2010 7:03 pm

    Then what you were given is wrong because it's trying to get you to factor four terms but that doesn't work right if the 2nd isn't to the 2nd power


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    Re: algebra/trig2

    Post by Dark Flame99966 on Sun Sep 19, 2010 7:04 pm

    I have no idea how you got that Ahmed


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    Re: algebra/trig2

    Post by Ahmed on Sun Sep 19, 2010 7:07 pm

    Well think about it.

    Dark Flame99966 wrote:And the third is
    2x-7|<9
    x= 8 or -1

    If I plug in 0 (zero). It would still be true. Yet that's not in your answer.


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    Re: algebra/trig2

    Post by Dark Flame99966 on Sun Sep 19, 2010 7:21 pm

    Because I was taught to find two definite answers and it's assumed that anything in between works.


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    Re: algebra/trig2

    Post by Ahmed on Sun Sep 19, 2010 7:28 pm

    ^^^Very wrong. You said "x= 8 or -1". That means that assumption isn't valid anymore.

    But besides that, yes your answer of 8>x>-1 is correct. I solved it incorrectly. (Misread it)


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    Re: algebra/trig2

    Post by Dark Flame99966 on Sun Sep 19, 2010 7:30 pm

    Okay, x= 8 AND -1

    Happy?


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    Re: algebra/trig2

    Post by Ahmed on Sun Sep 19, 2010 7:33 pm

    No. That is still wrong.

    8>x>-1 is correct.

    You could also do this in set notation or graph it. But using AND or OR in this question would be wrong.


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    Re: algebra/trig2

    Post by Justice on Sun Sep 19, 2010 8:37 pm

    Guys stop arguing let me take a look...


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    Re: algebra/trig2

    Post by Ahmed on Sun Sep 19, 2010 9:18 pm

    And what did you find doctor?


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    Re: algebra/trig2

    Post by Doc on Sun Sep 19, 2010 9:43 pm

    u guys r losers
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    Re: algebra/trig2

    Post by Dark Flame99966 on Sun Sep 19, 2010 10:01 pm

    <_<
    My teacher always made us use and or OR rather than need interval notation.


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    Re: algebra/trig2

    Post by Justice on Sun Sep 19, 2010 10:04 pm

    2x^2-18x-72=
    2(x-12)(x+3)

    12x^3+2x-30x-5=
    12x^3- 28x-5

    |2x-7|<=9
    -1<= x <= 8


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    Re: algebra/trig2

    Post by preid1220 on Wed Sep 29, 2010 8:46 pm

    got another one for y'all,

    show all work and every possible answer type... i hate my math teacher


    |x-3|<2x-4


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    Re: algebra/trig2

    Post by Ahmed on Wed Sep 29, 2010 8:54 pm

    x-3<2x-4
    x>1

    x-3>-2x+4
    x>7/3


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    Re: algebra/trig2

    Post by jj16802 on Wed Sep 29, 2010 9:10 pm

    preid1220 wrote:got another one for y'all,

    show all work and every possible answer type... i hate my math teacher


    |x-3|<2x-4
    Who do you have, Lessig? I think we're way ahead of you.


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    Re: algebra/trig2

    Post by preid1220 on Wed Sep 29, 2010 9:54 pm

    no, this was on a review ditto for a test tomorrow and my answers didn't match up with what was on the answer key... but Laluna is an poor teacher and makes alot of mistakes so i thought i should check with you guys.

    also Ahmed

    x-3>-2x+4
    that would become 3x>1 right? how does that reduce to 7/3? (I wish i dint sleep in class two years ago.)


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    Re: algebra/trig2

    Post by Ahmed on Wed Sep 29, 2010 10:11 pm

    x-3>-2x+4
    x>-2x+7
    3x>7
    x>7/3


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    Re: algebra/trig2

    Post by preid1220 on Wed Sep 29, 2010 11:22 pm

    o i see now, i was treating the -3 as a +3


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    Re: algebra/trig2

    Post by Dark Flame99966 on Wed Sep 29, 2010 11:29 pm

    Preid, this is simple stuff Mellow Even I know this and I'm a freshman (though admittedly I already took algebra 2)


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    Re: algebra/trig2

    Post by preid1220 on Thu Sep 30, 2010 6:06 pm

    Dark Flame99966 wrote:Preid, this is simple stuff Mellow Even I know this and I'm a freshman (though admittedly I already took algebra 2)

    ye, I'm messing up because I'm trying to hard and forgetting my basics =P


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    Re: algebra/trig2

    Post by Ahmed on Thu Sep 30, 2010 9:27 pm

    You must construct additional pylons.


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