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Deffense [45]
2 years ago
7

A parabola can be represented by the equation x2 = 2y. What are the coordinates of the focus and the equation of the directrix?

focus: (0,8); directrix: y = –8 focus: (0, one-half); directrix: y = negative one-half focus: (8,0); directrix: x = –8 focus: (one-half, 0); directrix: x = negative one-half
Mathematics
1 answer:
Airida [17]2 years ago
6 0

Answer:

b)

<em>i) Focus ( 0,a) = </em>(0,\frac{1}{2} )<em></em>

<em>ii) The equation of the directrix is </em>

<em>                             </em>y = -\frac{1}{2}  or y +\frac{1}{2} =0

Step-by-step explanation:

<u>Step(i)</u>:-

  <em> </em><em> A parabola is the set of all points in a plane that are equidistant from a fixed line and a fixed point (not in a line) in the plane </em>

<em>• The Fixed line is called the directrix of the parabola. </em>

<em>• The Fixed point is called the focus of the parabola. </em>

<em>• A line through the focus and perpendicular to the directrix is called the axis of the parabola. </em>

<em>• The point of intersection of parabola with the axis is called the vertex of the parabola. </em>

<em>Given Parabola x² = 2 y</em>

<em>Comparing  x² = 4 a y</em>

<em>                    4 a = 2</em>

<em>                      </em>a = \frac{1}{2}<em></em>

<em>   Focus ( 0,a) = </em>(0,\frac{1}{2} )<em></em>

<u><em>Step(ii)</em></u>

<em>The equation of the directrix is y = -a or y +a=0</em>

<em>The equation of the directrix is </em>

<em>                             </em>y = -\frac{1}{2}  or y +\frac{1}{2} =0<em></em>

<em>The equation of the directrix is 2 y +1 =0</em>

<em> </em>

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The following prism is made up of 27 identical
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The greatest possible surface area of the prism is 78 square units, it is obtained by removing center cube on each side of the prism.

Step-by-step explanation:

The given is,

                Prism is made up of 27 identical  cubes

Step:1

               Ref attachment,

               Let, surface area of one of cube = 1 square units

               Surface area of given prism,

               In the given diagram it have 9 cube sides in each side of prism.

                                  1 surface prism = 9 surface of cube

               Surface area of given prism = 6 × Surface of prism

                                                              = 6 × 9

                                                              = 54 square units          

Step:2 Check for alternative's

          For removing one cube on the edge of prism,

                      1 surface of prim = 9 surfaces of cube

          Surface area after removing cube on each side,

                                             = 6 × 11 = 66 square units

           For removing  cube on corner of prism,

                      1 surface of prim = 9 surfaces of cube

           Surface area after removing cube on corner,

                                             = 6 × 9 = 54 square units

          For removing center cube on each side,

                     1 surface of prim = 13 surfaces of cube

           Surface area after removing cube on corer on the prism,

                                                  = 6 × 13 = 78 square units

   Surface area after removing corner cube on prism = 78 square units

Result:

       The greatest possible surface area of the prism is 78 square units, it is obtained by removing center cube on each side of the prism.

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