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Math Help - graphing

  1. #1
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    graphing

    how do i do it to graph this in a calculator x= y^2 + 2y + 1
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  2. #2
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    Don't laugh.

    Graph this: y = x^2 + x + 1

    Then turn your calculator 1/4 turn clockwise. :-)
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  3. #3
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    it is funny, but there is not another way to do it? like solving for y
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  4. #4
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    You can solve for y, but you may not be happy with the results. You should get TWO different pieces. It is not a "function", so it takes a bit more effort.

    I'd just turn the calculator. Don't you think your classmates would get a hoot out of it? Maybe your teacher has a sense of humor? It demonstrates a knowledge of reflection across the line x = y. Don't you want to be the first on in your class to claim that knowledge?
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  5. #5
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    Hahaha you were probably told to graph the inverse of  y =x^2 +x +1 as TKHunny said.

    You can't take the inverse of a quadratic in polynomial form. You have to complete the square and put it into Turning Point form then swap x and y and solve for y.
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  6. #6
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    Okay, technically, you should grab your calculator by the upper right and lower left corners and flip it over, but in this case the 90 rotation is a good substitute.
    Last edited by TKHunny; May 19th 2011 at 02:14 PM.
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  7. #7
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    Quote Originally Posted by homerb View Post
    how do i do it to graph this in a calculator x= y^2 + 2y + 1
    Please post the entire question.

    (Otherwise: x = (y + 1)^2 + 1 \Rightarrow \pm \sqrt{x - 1} = y + 1 \Rightarrow y = ...., which is of a form that can be eneterd into a graphics calculator.)
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