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    Here is the question:
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    a) I don't know how you would find the radius from the given equation. Can you please explain it to me and walk me through?
    b) I don't know how I would find the radius. The only equation I know to do with this (idk if it helps) is (x-a)^2 + (y-b)^2 = r^2. How do you do a question like this? Please can you help?
    c) Normally, I know that something crosses the x axis when y=0, but how do I do that here? How do I know which equation to put y=0 as?
    d) I have no clue with this one.

    I would especially like help with a b and c please. Can you please walk me through, and explain why you do each step, and what each step actually is?

    Thank you!
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    (Original post by blobbybill)
    Here is the question:
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    a) I know this is (5,0).
    b) I don't know how I would find the radius. The only equation I know to do with this (idk if it helps) is (x-a)^2 + (y-b)^2 = r^2. How do you do a question like this? Please can you help?
    c) Normally, I know that something crosses the x axis when y=0, but how do I do that here? How do I know which equation to put y=0 as?
    d) I have no clue with this one.

    I would especially like help with b and c please. Can you please walk me through, and explain why you do each step, and what each step actually is?

    Thank you!
    Yes you need to get it in the form (x-a)^2 + (y-b)^2 = r^2.

    To do this you need to complete the square for the x terms and y terms separately. So for the x terms you can do

    x^2-10x = (x-5)^2-25

    Can you try the same for the y terms then join it all together?

    This is a common method in exam questions that you need to get used to.
 
 
 
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