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    booper563's Avatar
    booper563 Posts: 2, Reputation: 1
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    #1

    Oct 29, 2008, 02:48 PM
    parabola x intercept
    The vertex of a parabola is (1,2). One x intercept is 1+squareroot5. What is the other x intercept? Explain.

    Details pleeease
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Oct 30, 2008, 03:23 AM

    A parabola is symmetric about its vertex. Here, it is on the x-coordinate 1. So, if one of its x-intercept is 0, the other will be 2, since

    1-1 = 0 (x-coordinate of vertex - certain number)
    1+1 = 2 (x-coordinate of vertex + that same number above)

    So, if one of the x-intercepts is , the 'certain number' I included above is . So, now can you find out the other intercept?

    If you didn't understand well and need more explanation, post. Yes, I almost forgot, post your answer.
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