# advanced math

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?

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asked by Sharon
1. 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

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posted by bobpursley
2. 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.

:)

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posted by No name
3. Thank you no name. :)

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posted by Sharon

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