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Mast C1 Past paper question help

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    I'm interested in part D - I've looked at the mark scheme and you need to square AC somehow but I don't really understand it, if someone can have a go at the question and let me know how they got the 'show that' answer it would be great, thanks.
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    Why are people repping me >.< What have I done ....

    Just asking a question.
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    you use pythagoras

    same as you did in (c)

    C is (p,y)

    where y is found by using the equation in part (a)
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    (Original post by freedomyak)
    The co-ordinates of C are  \displaystyle \left(p, \  - \frac12p + 6 \right)

    The co-ordinates of A are  (2, \ 5)

     AC = 5

    Use,  AC^2 = (y_2-y_1)^2 + (x_2-x_1)^2


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