advanced math

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I did the math for the previous problem I posted, using this formula: -b+ or - the square root of b^2-4ac/2a. When I did this for -x^2+2x-1, I got 0/-2. I did the math and the x and y intercept came out to be -2 and -2. But when I graphed this on my graphic calculator, the points didn't cross through -2, and my answer sounds wrong. How can I fix this?

  • advanced math -

    a=-1 b=2 c=-1

    b^2-4ac is zero

    x=-1, double root. I don't know how you got zero and -2

  • advanced math -

    by using the formula you should get

    x1=x2=1

    so your graph will be upside down porabola with y intercept at -1 so the graph will cut the y-axis at -1, and touch the x-axis at 1.

    :)

  • advanced math -

    Thank you no name. :)

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