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Persamaan grafik fungsi kuadrat yang memiliki titi...

Persamaan grafik fungsi kuadrat yang memiliki titik puncak left parenthesis 5 comma 2 right parenthesis dan melalui titik left parenthesis 4 comma 0 right parenthesis adalah ... .

  1. f left parenthesis x right parenthesis equals negative 2 x squared plus 20 x minus 48

  2. f left parenthesis x right parenthesis equals negative 2 x squared minus 20 x minus 48 

  3. f left parenthesis x right parenthesis equals 2 x squared plus 20 x minus 50 

  4. f left parenthesis x right parenthesis equals 2 x squared minus 20 x plus 50 

  5. f left parenthesis x right parenthesis equals 2 x squared minus 20 x minus 50 

Jawaban:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell y minus y p end cell equals cell a left parenthesis x minus x p right parenthesis squared space end cell row cell 0 minus 2 end cell equals cell a left parenthesis 4 minus 5 right parenthesis squared space space space end cell row cell negative 2 end cell equals cell a times 1 space space end cell row a equals cell negative 2 space space end cell row blank blank blank row y equals cell a left parenthesis x minus x p right parenthesis squared plus y p space space end cell row y equals cell negative 2 left parenthesis x minus 5 right parenthesis squared plus 2 space space end cell row y equals cell negative 2 left parenthesis x squared minus 10 x plus 25 right parenthesis plus 2 space space end cell row y equals cell negative 2 x squared plus 20 x minus 50 plus 2 space space end cell row y equals cell negative 2 x squared plus 20 x minus 48 end cell end table end style

Jadi, jawaban yang tepat adalah A.

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