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Math Help - Cant solve distance formula problem.

  1. #1
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    Cant solve distance formula problem.

    (0, b),(3,1); d = 5 Solve for b. I must be stupid or something. I keep getting 15, 17.
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    Re: Cant solve distance formula problem.

    sqr root((3-0)^2)+)(1-b)^2) =5
    ((3-0)^2)+)(1-b)^2) = 5^2
    1-2b+b^2=9
    b^2-2b-8=0
    b^2 -4b +2b -8=0
    b(b-4)+2(b-4)=0
    (b-4)(b+2)=0
    b=4,-2.
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  3. #3
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    Re: Cant solve distance formula problem.

    Are you sure, my calculator keeps giving me 5, -3 Your probably right.
    Last edited by Kanderson; April 23rd 2012 at 05:09 PM.
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  4. #4
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    Re: Cant solve distance formula problem.

    No calculator is right,and the one below me is right,i just flipped halfway through the problem,but essentially thats how you do it.
    Last edited by syedmaheen; April 23rd 2012 at 06:14 PM.
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  5. #5
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    Re: Cant solve distance formula problem.

    (3-0)^2 + (1-b)^2 = 5^2

    9 + (1 - 2b + b^2) = 25

    b^2 - 2b - 15 = 0

    (b - 5)(b + 3) = 0

    b = 5 , b = -3
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  6. #6
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    Re: Cant solve distance formula problem.

    Quote Originally Posted by syedmaheen View Post
    sqr root((3-0)^2)+)(1-b)^2) =5
    ((3-0)^2)+)(1-b)^2) = 5^2
    So 9+ 1- 2b+ b^2= 25
    Subtracting 9 from both sides, 1- 2b+ b^2= 16, not 9.

    1-2b+b^2=9
    b^2-2b-8=0
    b^2 -4b +2b -8=0
    b(b-4)+2(b-4)=0
    (b-4)(b+2)=0
    b=4,-2.
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