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Conic Section

Short Answer Type

51. In the following, find the co-ordinates of the focus, axis of the parabola, the equation of the directrix and length of the latus rectum.

space space space space straight x squared equals 6 straight y

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52. In the following, find the co-ordinates of the focus, axis of the parabola, the equation of the directrix and length of the latus rectum.

straight x squared space equals negative 9 straight y

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53. Find: the co-ordinates of the focus and the vertex, the equations of axis, tangent at the vertex and directrix, the length of latus rectum of the parabola.

2 straight y squared minus 9 straight x equals 0

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54. Find: the co-ordinates of the focus and the vertex, the equations of axis, tangent at the vertex and directrix, the length of latus rectum of the parabola.

4 straight x squared plus 9 straight y equals 0

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55. Find the equation of the parabola whose focus is at point S (2, 5) and the directrix is line 3x + 4y + 1 = 0.

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56. Find the equation of the parabola whose vertex is at (0, 0) and the focus is at point S (5, 0).

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57. Find the equation of the parabola whose vertex is at (0, 0) and the focus is at point (-3, 0).

The vertex is at (0, 0) and the focus is at (-3, 0). For both the points y = 0
∴ Axis of the parabola is y = 0 or the x-axis.
$rightwards double arrow$ Equation of the parabola in the standard form is $straight y squared equals 4 ax$
Also, focus $straight S space left parenthesis straight a comma space 0 right parenthesis space left right arrow space straight S space left parenthesis negative 3 comma space 0 right parenthesis space rightwards double arrow space straight a space equals space minus 3$
Hence, the equation of the parabola is $straight y squared equals 4 left parenthesis negative 3 right parenthesis straight x space or space straight y squared equals negative 12 straight x$

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58. Find the equation of the parabola whose vertex is at (0, 0) and focus is at (0, – 2).

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59. Find the equation of the parabola that satisfying the following condition:
Vertex (0,0) passing through (2,3) and axis is along x-axis.

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60. Find the equation of the parabola that satisfying the following condition:
Vertex at (0,0), symmetrical about y-axis and passing through the point (2, –3)

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