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    shybaby's Avatar
    shybaby Posts: 1, Reputation: 1
    New Member
     
    #1

    Nov 28, 2009, 04:13 PM
    n2+4n-12=0 algebra 1b
    n2+4n-12=0
    medic-dan's Avatar
    medic-dan Posts: 321, Reputation: 23
    Full Member
     
    #2

    Nov 28, 2009, 04:44 PM

    Homework question?

    Get rid of the -12 side by adding 12 to both sides.

    n2+4n-12+12= 0+12

    n2+4n = 12

    Now can you solve it?
    mathwiz3502's Avatar
    mathwiz3502 Posts: 121, Reputation: 1
    Junior Member
     
    #3

    Nov 28, 2009, 04:57 PM

    This will help you for any of these problems
    n^2+4n-12=0
    factor
    (n-2)(n+6)=0
    now since these are multiplied the zero property of multiplication says that at least one of these must equal 0
    so you get
    n-2=0
    and
    n+6=0
    solve them and you get
    n=2 and -6
    for proof
    2^2+2(4)-12=0
    4+8-12=0
    0=0
    (-6)^2+-6(4)-12=0
    36+-24-12=0
    0=0
    give me feedback
    medic-dan's Avatar
    medic-dan Posts: 321, Reputation: 23
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    #4

    Nov 28, 2009, 08:53 PM

    I thank you mathwizard. It's been a while but now that you post that I'm thinking FOIL again.
    morgaine300's Avatar
    morgaine300 Posts: 6,561, Reputation: 276
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    #5

    Nov 28, 2009, 11:58 PM

    Quite frankly, I don't see the point of all that. Subtract the constant, combine like terms, divide, you're done.

    Of course, OP didn't say what the instructions actually were, but without seeing otherwise, I assume solving for n.
    mathwiz3502's Avatar
    mathwiz3502 Posts: 121, Reputation: 1
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    #6

    Nov 29, 2009, 05:20 AM

    morgaine, many people coud not solve
    n^2+4n=12 because they would not think of negative 6, and since I'm actually taking the same course, no joke in acc. int. advanced math 1 and some off 2, so I know there will soon be harder equations which is why I tell him the "long 100% way."
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #7

    Dec 1, 2009, 08:01 AM

    There's another method, that however is a little more complex. It's called completing the square. Demonstration:















    So, n = -4 - 2 = -6 or
    n = 4 - 2 = 2

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