Sunday, February 12, 2012

Welcome

Ok 8th graders... We are about to embark on a new endeavor.  We are going to attempt a math blog.  There are a few rules that we need to follow:

1) All comments that you make are to be school appropriate.  Keep it positive.
2) Keep the conversations on mathematics and what you are learning.
3) Make sure that you are respectful of the others that are posting.

Your first post will be this: Describe how to find the x-intercepts, y-intercept, max/minimum value, and point of symmetry of a quadratic graph (parabola).  

25 comments:

  1. The x-intercepts can be found where the parabola crosses the x-axis. There is usually two.

    Y-intercept where the line on the graph crosses the y-axis. There is usually only one.

    The max/minimum value is if the graph is up or down. If it is facing up it is a minimum value. If it is down it is a maximum value.

    Point of symmetry : If you fold the graph in half. That is the point of symmetry.

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    1. Johnna- Very clear descriptions. I do have 1 question. What do you mean when you say the graph is facing up or down? Does facing mean the same as the way it opens or does facing mean the way the tip of the graph points? Nicely done.

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  2. The x-intercepts can be found where the parabola crosses the x-axis. There is usually two.

    Y-intercept - the line that goes up

    Minimum value - is what the parabola is low

    Maximum value - how high it goes

    Line of symmetry - the point of symmetry

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    1. Maria-
      Yes Maria the y-axis goes up and down, but the y-intercept is something more specific than that. Maybe someone can help you with a post here. Other 8th graders- please help Maria out with y-intercept and line of symmetry.

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    2. Y- intercept goes straight ??

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    3. This comment has been removed by the author.

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    4. Um.....sometimes it goes straight but not all the time it depends on the equation I guess.

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    5. I'm pretty sure that the y-axis is always straight. But what is important is that it is the point where the graph crosses the y-axis when x is equal to 0.

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  3. The x-intercepts - can be found where the parabola crosses the x-axis. There is usually two.

    Y-intercept- the point in the graph where the x-point is zero.

    Maximum Value - The highest point in a graph.

    Minimum Value - The lowest point in a graph.

    Point Of Symmetry - Being made up of exactly similar parts facing each other.


    DonShay~

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    1. Yes DonShay. Nice!! I do have a question though... Why is the x-point always zero at the y-intercept? What is special about that point?

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    2. Because its the point where the function meets the Y-axis.

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  4. X-intercept-It can be found where the quadratic graph crosses the x-axis. And there is usually two of them.

    Y-intercept- The point on the graph that is zero.

    Maximum Value- The highest point in the graph.

    Minimum Value- The lowest value in the graph.

    Point of symmetry- The part that is made up of exactly similar parts facing eachother.


    David R.

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    1. David- Can you help me with y-intercept? What point on the graph needs to be zero?

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    2. The y-intecept is when the y-intercept crosses anywhere over the x-axis that is zero.

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    3. Ok that makes it much easier. Now I know from what you said that x must be zero for me to find the y-intercept.

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  5. x-intercept is when the line on the quadratic graph crosses the x-axis. There are usually two.

    y-intercept is when the line on the graph crosses the y-axis. There is usually one.

    maximum value is the highest point on the graph, and the minimum value is the lowest point on the graph.

    and the point of symmetry is the point in-between the two x-intercepts.

    Matthew

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    1. Alright Matthew!! Very clear. The only thing I might add is that the point of symmetry is EXACTLY between the 2 x-intercepts.

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  6. y-intercept can be found where the parabola crosses the x-axis. There is usually two.

    x-intercept when the line crosses the x-axis and it is usually zero.

    max value is the highest point on the graph.

    minimum value lowest point on the graph.

    The point of symmetry is the points the equal each other.

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    1. Better check the y-intercept and x-intercept part of this. You use x-axis twice but one deals with the y value.

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    2. I think the x-intercept uses the y value I might have read the wrong one!

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    3. Now I'm confused. Go through each point and see what you might need to re-type. It's up to you to decide.

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    4. i really don't know what I am talking about I thought i had it right the first time?

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  7. The maximum value is the highest point on the graph. & its facing up like a upside down "U"
    and the minimum value is the lowest point on the graph. like a "U".

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    1. Excellent Johnna. That made everything clear for me. You can just hit reply below the reply to your post rather than just starting a new post. Either way works!! Thanks Johnna for the insight.

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