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Math Help - Another solve

  1. #1
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    Post Another solve

    root of 2k+1=21

    can someone please show me this step how my friend got 121? then 441 i got lost


    2k =440
    /2 /2

    k=220


    Next problem: root of 4x-9-2=0

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  2. #2
    Bar0n janvdl's Avatar
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    I also get k = 220.
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  3. #3
    Bar0n janvdl's Avatar
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    Set k = 121 and ull see it doesnt work out.
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  4. #4
    Bar0n janvdl's Avatar
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    Root(4x - 9 - 2) = 0
    4x - 9 - 2 = 0 squared
    4x = 11
    thus x = 2.75
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  5. #5
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    im def going to fail this last chapter this radical root stuff isent my thing at all why do the hard chapters always come in the end?!?!

    If someone on here is making a math book pleaseeee make the hard stuff in the beg of the book and easy stuff near the back.
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  6. #6
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by rj2001 View Post


    Next problem: root of 4x-9-2=0

    This is a weird question, why write -9 - 2, why not just say -11. anyway, janvdl is right
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  7. #7
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    yeah this is what the questions says and the answer is 13/4
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  8. #8
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    Quote Originally Posted by rj2001 View Post
    ...


    Next problem: root of 4x-9-2=0
    Hello,

    I assume that there are some brackets missing. If you have:

    √(4x-9) - 2 = 0
    √(4x-9) = 2 now square both sides

    4x - 9 = 4
    4x = 13
    x = 13/4
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  9. #9
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    ahh yes thanks! this whole review sheet is full of typos he corrected in class guess he forgot others thanks
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  10. #10
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by earboth View Post
    Hello,

    I assume that there are some brackets missing. If you have:

    √(4x-9) - 2 = 0
    √(4x-9) = 2 now square both sides

    4x - 9 = 4
    4x = 13
    x = 13/4
    forgetting parenthesis causes a whole lot of problems
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