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Q17.
Expert-verifiedIdentify the coordinates of the vertex and focus, the equations of the axis of symmetry and directrix, and the direction of opening of the parabola with the given equation . Then find the length of latus rectum and graph the parabola.
The vertex is . Focus is . Axis of symmetry is . The equation of directrix is . The direction of opening of parabola is towards right. The length of latus rectum is .
The given equation is .
For two different forms of equations of parabola stated below, use the following key-concept to find vertex, axis of symmetry, focus, directrix, direction of opening of parabola and length of latus rectum.
The given equation is converted to standard form as:
Comparing with , .
The vertex and focus, the equations of the axis of symmetry and directrix, and the direction of opening of the parabola are evaluated as:
The vertex is .
Focus is evaluated as:
Axis of symmetry is .
The equation for directrix is evaluated as:
The direction of opening of parabola is right because .
The length of latus rectum is evaluated as:
The graph of the parabola is shown below.
The vertex is . Focus is . Axis of symmetry is . The equation of directrix is . The direction of opening of parabola is towards right. The length of latus rectum is .
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