Conics - Parabola

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Now Playing:Conics parabola– Example 1
Examples
  1. vertical parabola VS. horizontal parabola
    Sketch the following vertical parabolas:
    i) y=x2y = {x^2}
    ii) y=2x2y = 2{x^2}
    iii) y=2(x+3)2+1y = 2{\left( {x + 3} \right)^2} + 1
    Conics - Parabola
    Notes
    parabola: a curve formed from all the points that are equidistant from the focus and the directrix.
    vertex: midway between the focus and the directrix
    focus: a point inside the parabola
    directrix: a line outside the parabola and perpendicular to the axis of symmetry

    conics formula for parabola:
    p=14ap = \frac{1}{{4a}} p: distance between the vertex and the focus / directrix.
    a: coefficient of the squared term