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    C1 solomon paper L
    says 1 real root is that the same as two equal roots
    Question 3a

    https://doc-10-5g-docs.googleusercon...jRXVmtoc0I3azg

    Also for 6b I got the answer like this:
    gradient of m=2/5
    y-y1=2/5(x-x1)
    5y-5y1=2x-2x1
    2x-5y+(-2x1+5y1)

    this part will just be a number
    so k=-5
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    (Original post by Acrux)
    C1 solomon paper L
    says 1 real root is that the same as two equal roots
    Question 3a

    https://doc-10-5g-docs.googleusercon...jRXVmtoc0I3azg
    You tend to say that there are equal roots if the discriminant is 0. So there are 2 equal roots to this quadratic.
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    (Original post by Acrux)
    C1 solomon paper L
    says 1 real root is that the same as two equal roots
    Question 3a
    In reference to 3)a) The only way to have one real root in a quadratic is if the root is repeated, am i right in saying you worked out that the discriminant of f(x) was equal to 0?

    Also, did you have a problem with 6b or are you just saying what you got?
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    (Original post by Acrux)
    so k=-5
    This is fine and correct.
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    (Original post by B_9710)
    You tend to say that there are equal roots if the discriminant is 0. So there are 2 equal roots to this quadratic.
    So it is correct, just that mark scheme says 1 real root
    discriminant = 0

    Also can some check the other problem in OP 6b - Okay thanks Zacken
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    (Original post by Acrux)
    So it is correct, just that mark scheme says 1 real root
    discriminant = 0

    Also can some check the other problem in OP
    Yes.

    Can you check my post?
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    (Original post by Zacken)
    Yes.

    Can you check my post?
    Yes.
    Is part one correct in saying two equal roots mark scheme says 1 equal root.. dont want to drop easy marks
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    (Original post by Acrux)
    Yes.
    Is part one correct in saying two equal roots mark scheme says 1 equal root.. dont want to drop easy marks
    Yeah, they both basically mean the same thing. Although saying 1 equal root is nonsensical. You either say 1 real/real and repeated root or two equal real roots.
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    (Original post by Zacken)
    Yeah, they both basically mean the same thing. Although saying 1 equal root is nonsensical. You either say 1 real root or two equal real roots.
    Thanks.
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    (Original post by Acrux)
    Yes.
    Is part one correct in saying two equal roots mark scheme says 1 equal root.. dont want to drop easy marks
    Are you sure it said 1 equal root? not 1 repeated root?
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    (Original post by LewisClothier)
    Are you sure it said 1 equal root? not 1 repeated root?
    Yes I meant 1 real root not 'equal'
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    (Original post by Acrux)
    Yes I meant 1 real root not 'equal'
    okay yeah that makes more sense, I'd say if it's a question that is asking for a quantity or a number of roots and you know that the discriminant is zero, always put 1 to show you know what that means, it is unlikely that moderators would look at whether or not you said equal/repeated etc. They will simply see if you put 0, 1 or 2 and mark correct for 1, so to be sure I'd always write 1 real root there.
 
 
 
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