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Math Help - translation

  1. #1
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    translation

    hi, i've got the question:

    write down the equation of the circle which is obtained by applying the given translation to the given circle:

    [-4, 1], x^2 + y^2 - 81 = 0

    the answer i came up with was (x + 4)^2 + (y - 1)^2 = 81 and the answer the book gives is (x + 4)^2 + (y - 1)^2 - 81 = 0

    i would presume these were the same, i was just writing to make sure there wasn't some reason you couldn't express it the way i did, could someone tell me if i'm right please, thanks
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  2. #2
    MHF Contributor Amer's Avatar
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    Quote Originally Posted by mark View Post
    hi, i've got the question:

    write down the equation of the circle which is obtained by applying the given translation to the given circle:

    [-4, 1], x^2 + y^2 - 81 = 0

    the answer i came up with was (x + 4)^2 + (y - 1)^2 = 81 and the answer the book gives is (x + 4)^2 + (y - 1)^2 - 81 = 0

    i would presume these were the same, i was just writing to make sure there wasn't some reason you couldn't express it the way i did, could someone tell me if i'm right please, thanks
    it is the same
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