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Grafik suatu fungsi kuadrat memotong sumbu X di titik A , dan memotong sumbu Y di titik C 0,8 Persamaan grafik fungsi tersebut adalah ...

Grafik suatu fungsi kuadrat memotong sumbu X di titik Error converting from MathML to accessible text.Error converting from MathML to accessible text. dan memotong sumbu  di titik Error converting from MathML to accessible text. Persamaan grafik fungsi tersebut adalah ...

  1. y equals negative 2 x squared plus 10 x plus 8

  2. y equals negative 2 x squared minus 10 x plus 8

  3. y equals negative 2 x squared minus 6 x plus 8

  4. y equals negative 2 x squared plus 6 x plus 8

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S. Eka

Master Teacher

Mahasiswa/Alumni Universitas Pendidikan Indonesia

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begin mathsize 14px style Persamaan space fungsi space kuadrat space adalah straight f left parenthesis straight x right parenthesis equals straight y equals ax squared plus bx plus straight c  Substitusi space titik space left parenthesis negative 1 comma 0 right parenthesis comma space left parenthesis 4 comma 0 right parenthesis comma space left parenthesis 0 comma 8 right parenthesis space colon left parenthesis negative 1 comma 0 right parenthesis rightwards arrow straight a minus straight b plus straight c equals 0 space... left parenthesis straight i right parenthesis left parenthesis 4 comma 0 right parenthesis rightwards arrow 16 straight a plus 4 straight b plus straight c equals 0... left parenthesis ii right parenthesis left parenthesis 0 comma 8 right parenthesis rightwards arrow straight c equals 8 space... left parenthesis iii right parenthesis  Substitusi space nilai space straight c space pada space pers. space left parenthesis ii right parenthesis space dan space left parenthesis iii right parenthesis space colon Persamaan space left parenthesis ii right parenthesis space colon straight a minus straight b plus left parenthesis 8 right parenthesis equals 0 space straight a minus straight b equals negative 8 space left parenthesis asterisk times right parenthesis Persamaan space left parenthesis iii right parenthesis space colon 16 straight a plus 4 straight b plus left parenthesis 8 right parenthesis equals 0 16 straight a plus 4 straight b equals negative 8 4 straight a plus straight b equals negative 2 space left parenthesis asterisk times asterisk times right parenthesis  Eliminasi space persamaan space left parenthesis asterisk times right parenthesis space dan space left parenthesis asterisk times asterisk times right parenthesis space colon space space space straight a minus straight b equals negative 8 fraction numerator 4 straight a plus straight b equals negative 2 space plus over denominator space space space space 5 straight a equals negative 10 end fraction space space space space space space space space space straight a equals negative 2  Hitung space nilai space straight b space dan space straight c space colon straight a minus straight b equals negative 8 left parenthesis negative 2 right parenthesis minus straight b equals negative 8 left parenthesis negative 2 right parenthesis plus 8 equals straight b straight b equals 6  straight a minus straight b plus straight c equals 0 left parenthesis negative 2 right parenthesis minus left parenthesis 6 right parenthesis plus straight c equals 0 straight c equals 8  Jadi space persamaan space kuadratnya space colon straight y equals negative 2 straight x squared plus 6 straight x plus 8 end style

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