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Tentukan bayangan parabola y = x 2 + 24 karena didilatasi dengan pusat ( 1 , − 2 ) dan faktor skala − 2 .

Tentukan bayangan parabola  karena didilatasi dengan pusat  dan faktor skala .

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O. Rahmawati

Master Teacher

Mahasiswa/Alumni UIN Sunan Gunung Djati Bandung

Jawaban terverifikasi

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Pembahasan

Dilatasi dengan pusat dan . diperoleh: dan Substitusi persamaan (1) dan (2) ke parabola : Jadi, bayangan parabola adalah .

L identical to y equals x squared plus 24 rightwards arrow with P left parenthesis 1 comma negative 2 right parenthesis space k equals negative 2 on top L apostrophe

Dilatasi dengan pusat P left parenthesis 1 comma negative 2 right parenthesis dan k equals negative 2.

open parentheses table row cell x apostrophe end cell row cell y apostrophe end cell end table close parentheses equals open parentheses table row k 0 row 0 k end table close parentheses open parentheses table row cell x minus a end cell row cell y minus b end cell end table close parentheses plus open parentheses table row a row b end table close parentheses open parentheses table row cell x apostrophe end cell row cell y apostrophe end cell end table close parentheses equals open parentheses table row cell negative 2 end cell 0 row 0 cell negative 2 end cell end table close parentheses open parentheses table row cell x minus 1 end cell row cell y minus left parenthesis negative 2 right parenthesis end cell end table close parentheses plus open parentheses table row 1 row cell negative 2 end cell end table close parentheses open parentheses table row cell x apostrophe end cell row cell y apostrophe end cell end table close parentheses equals open parentheses table row cell negative 2 x plus 1 end cell row cell negative 2 y minus 4 end cell end table close parentheses plus open parentheses table row 1 row cell negative 2 end cell end table close parentheses open parentheses table row cell x apostrophe end cell row cell y apostrophe end cell end table close parentheses equals open parentheses table row cell negative 2 x plus 1 plus 1 end cell row cell negative 2 y minus 4 minus 2 end cell end table close parentheses open parentheses table row cell x apostrophe end cell row cell y apostrophe end cell end table close parentheses equals open parentheses table row cell negative 2 x plus 2 end cell row cell negative 2 y minus 6 end cell end table close parentheses

diperoleh:

table attributes columnalign right center left columnspacing 0px end attributes row cell x apostrophe end cell equals cell negative 2 x plus 2 end cell row cell 2 x end cell equals cell 2 minus x apostrophe end cell row x equals cell fraction numerator 2 minus x apostrophe over denominator 2 end fraction... left parenthesis 1 right parenthesis end cell end table

dan 

table attributes columnalign right center left columnspacing 0px end attributes row cell y apostrophe end cell equals cell negative 2 y minus 6 end cell row cell 2 y end cell equals cell negative 6 minus y apostrophe end cell row y equals cell fraction numerator negative 6 minus y apostrophe over denominator 2 end fraction... left parenthesis 2 right parenthesis end cell end table

Substitusi persamaan (1) dan (2) ke parabola L:

table attributes columnalign right center left columnspacing 0px end attributes row y equals cell x squared plus 24 end cell row cell fraction numerator negative 6 minus y apostrophe over denominator 2 end fraction end cell equals cell open parentheses fraction numerator 2 minus x apostrophe over denominator 2 end fraction close parentheses squared plus 24 end cell row cell fraction numerator negative 6 minus y apostrophe over denominator 2 end fraction end cell equals cell fraction numerator 4 minus 4 x apostrophe plus open parentheses x apostrophe close parentheses squared over denominator 4 end fraction plus 24 end cell row cell fraction numerator 4 left parenthesis negative 6 minus y apostrophe right parenthesis over denominator 2 end fraction end cell equals cell fraction numerator 4 minus 4 x apostrophe plus open parentheses x apostrophe close parentheses squared over denominator 4 end fraction plus 96 end cell row cell 2 left parenthesis negative 6 minus y apostrophe right parenthesis end cell equals cell 4 minus 4 x apostrophe plus open parentheses x apostrophe close parentheses squared plus 96 end cell row cell negative 12 minus 2 y apostrophe end cell equals cell 4 minus 4 x apostrophe plus open parentheses x apostrophe close parentheses squared plus 96 end cell row cell negative 2 y apostrophe end cell equals cell open parentheses x apostrophe close parentheses squared minus 4 x apostrophe plus 100 plus 12 end cell row cell y apostrophe end cell equals cell fraction numerator open parentheses x apostrophe close parentheses squared minus 4 x apostrophe plus 112 over denominator negative 2 end fraction end cell row cell y apostrophe end cell equals cell negative open parentheses x apostrophe close parentheses squared over 2 plus 2 x apostrophe minus 56 end cell end table

Jadi, bayangan parabola adalah y apostrophe equals negative open parentheses x apostrophe close parentheses squared over 2 plus 2 x apostrophe minus 56.

 

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