Algebra 1

I tried to graph y = x^2 - 4x + 4 and ended up with an x-intercept of -2 (the y-intercept is 4). However, according to wolfram, the x-intercept should be 2. Who is correct: me or the website?

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  1. y = x^2 - 4x+ 4
    = (x - 2)^2

    for x-intercept, let y = 0
    (x-2)^2 = 0
    x-2 = 0
    x = 2

    we have a double root at x = 2 , ( x=2 or x=2)

    see Wolfram:
    http://www.wolframalpha.com/input/?i=plot+y+%3D+x%5E2+-+4x+%2B+4

    Usually , I would put my money on Wolfram.

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    posted by Reiny

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