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Math Help - Maths help with equation of line and algebra?

  1. #1
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    Maths help with equation of line and algebra?

    Maths help with equation of line and algebra?

    point r is (10,0)
    point s is (-9,2)
    show tht length of rs is 3 root 5 not sure how to work out length of a line?

    also..
    x sqaured+2px+(3p+4)=0, p is a positive constant with real roots find the value of p
    do i expand first?? plz help!!
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  2. #2
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    Quote Originally Posted by lilz2009 View Post
    Maths help with equation of line and algebra?

    point r is (10,0)
    point s is (-9,2)
    show tht length of rs is 3 root 5 not sure how to work out length of a line?

    distance formula ...

    d = \sqrt{(x_1 - x_2)^2 + (y_1 - y_2)^2}

    also..
    x sqaured+2px+(3p+4)=0, p is a positive constant with real roots find the value of p
    do i expand first?

    ... use the discriminant test for roots

    b^2 - 4ac \geq 0
    ok?
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    im still not sure bout line
    i got square root of 365 not 3 root 5 must ha worked out s wrongly in previous question
    for p i got -4/3 is this right?
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  4. #4
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    Quote Originally Posted by lilz2009 View Post
    im still not sure bout line
    i got square root of 365 not 3 root 5 must ha worked out s wrongly in previous question
    distance between (10,0) and (-9,2) is \sqrt{365}

    sure you copied down the coordinates for r and s correctly?



    for p i got -4/3 is this right?
    how did you get that specific value for p?
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