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Posted by on Saturday, February 16, 2013 at 1:06pm.

Axis symmetry x=3 passing through (3,1) and (1,9)

Not sure how to solve

  • college algebra - , Saturday, February 16, 2013 at 2:03pm

    (3,1) is the vertex of the parabola.

    (1,9) and (5,9)

    y = ax^2 + bx + c

    Substitue in the point (3,1)
    1 = a(9) +b(3) +c

    Do the same for (1,9) and then again for (5,9)

    You will have 3 equations and 3 variables. Solve for a, b, c.

    There is also a formula to find the equation using the vertex and 1 point. you should be able to find it in your textbook or using a google search.

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