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Math Help - Getting an equation from a parabola graph!!!!!!!

  1. #1
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    Exclamation Getting an equation from a parabola graph!!!!!!!

    i have this graph of a modified parabola, and i need to gets its equation, but i have no idea on how to do it, can some one show me how?
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  2. #2
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    Quote Originally Posted by Sneaky View Post
    i have this graph of a modified parabola, and i need to gets its equation, but i have no idea on how to do it, can some one show me how?
    Start with the model y = ax^2 + bx + c. Now substitute the given data into this model to get a series of equations for a, b and c. Solve those equations simultaneously.
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  3. #3
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    still dont get it, for the y=ax^2 +bx + c
    i just get a point on the parabola line, (thats my x and y)
    but what do i sub in as a b and c???
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  4. #4
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    Quote Originally Posted by Sneaky View Post
    still dont get it, for the y=ax^2 +bx + c
    i just get a point on the parabola line, (thats my x and y)
    but what do i sub in as a b and c???
    Substitute the point (-2, 2) into y = ax^2 + bx + c. Get an equation.

    Substitute the point (0, 1) into y = ax^2 + bx + c. Get an equation.

    Substitute the point (1, -5/2) into y = ax^2 + bx + c. Get an equation.

    Solve the three equations simultaneously for a, b and c.
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