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?

  1. 0
  2. 0
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

    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.

    :)

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

    posted by Sharon

Respond to this Question

First Name

Your Response

Similar Questions

  1. Math

    Good evening. I posted a math question earlier that I never received any help on because someone posted something inappropriate. My new math problem is as follows: The area of a rectangular piece of a land is 3/16 square miles. If
  2. Math

    I need help with my math homework.I searched for homework help forums and I found the Jiskha Website on the Google Website so this is my first time.I am new. Math Homework: What is the value of number 3 in 2,539? What is the value
  3. Math

    Hoping Henry can help on previous prob. A ball is thrown upwards from a roof top, 80ft above the ground. It will reach a maximum vertical height and then fall back to the ground. The height of the ball from the ground at time T is
  4. math

    can someone help me set this up so i can solve. Problem #3 the posted speed limit for trucks along national route 3 is 35 MPH. how many kilometers will a convoy cover after 3.7 hours on the road traveling at the posted Problem # 5
  5. math,drbob222

    I'm sorry the problems i posted had a couple of errors how i posted it here they are: Posted by DrBob222 on Friday, November 24, 2006 at 6:19pm in response to Math. Thanks for showing your work. It helps us to know where you are
  6. English

    1. He can not solve the math problem. 2. He cannot solve the math problem. 3. He can't solve the math problem. 4. He could not solve the math problem. 5. He couldnot solve the math problem. 6. He couldn't solve the math problem.
  7. drbob222,math

    I've written back for the one i'm having trouble with of the previous in the previous message. Another question is that I want to verify doesn't this problem refer to solving. It is estimated that the Earth is losing 4000 species
  8. To Michael

    Here's the question you posted in response to another student. "Ms.Sue do you mind if i ask were you a math teacher or are you just a genius at math and why do you do this help online do you get any benefit for doing this?" I
  9. to Math Mate

    I posted a response down below to Math Mates comment I posted this because I was afraied nobody would see it...my physics lab thanks oncce again
  10. dr.bob222

    when you get a small little chance can you check my math in last message i posted. thank you. I read the post earlier but didn't post a response because I was confused by the c in the formula.

More Similar Questions