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Math Help - Test coming up, Review study ?'s Vertex,quadratics etc

  1. #1
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    Test coming up, Review study ?'s Vertex,quadratics etc

    Have a test coming up so I want to make sure my review is right. Got a little help in the precalc room but the test is on wed so if anyone can look through problems 3 thru 7 even if its just one id be greatful. Thanks in advance
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    Last edited by vikings20081983; November 2nd 2008 at 11:01 AM.
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  2. #2
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    recheck your solutions to #5 and #7.
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  3. #3
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    hey thanks ill do that, The other questions are right I take it? Man your very helpful
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  4. #4
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    for number 5, try squaring both sides
    and then expanding right side the question out
    then combine all like terms on one side of the equals sign
    and solve for the 2 values of x

    *hint: the answer is one of the choices
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  5. #5
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    Ok I think I fixed 5 and am sorta sure that I did 7 right. Thanks to all for checking!
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  6. #6
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    #5 ...

    \sqrt{x+5} = x+3

    x+5 = x^2 + 6x + 9

    0 = x^2 + 5x + 4

    0 = (x+1)(x+4)

    x = -1 or x = -4

    one of these solutions is extraneous ... you check it.

    #7 ...

    |5-x| < 4

    |x-5| < 4

    -4 < x-5 < 4

    1 < x < 9
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