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Pertanyaan

F u n g s i k u a d r a t d e n g an f ( − 2 ) = 0 , f ( 1 ) = − 9 d an f ( 2 ) = − 8 a d a l ah ....

  1. f open parentheses x close parentheses equals x squared minus 2 x minus 8

  2. f open parentheses x close parentheses equals x squared plus 2 x minus 8

  3. f open parentheses x close parentheses equals x squared minus 2 x plus 8

  4. f open parentheses x close parentheses equals x squared plus 2 x plus 8

  5. f open parentheses x close parentheses equals x squared minus x minus 8

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N. Rahayu

Master Teacher

Mahasiswa/Alumni Universitas Negeri Jakarta

Jawaban terverifikasi

Pembahasan

B e n t u k space u m u m space f u n g s i space k u a d r a t space a d a l a h space f left parenthesis x right parenthesis equals a x squared plus b x plus c  A k i b a t n y a space n i l a i space d a r i space colon f open parentheses negative 2 close parentheses equals 0 space ⟺ space a open parentheses negative 2 close parentheses squared plus b open parentheses negative 2 close parentheses plus c equals 0 space ⟺ 4 a minus 2 b plus c equals 0 horizontal ellipsis left parenthesis i right parenthesis f left parenthesis 1 right parenthesis equals negative 9 space space ⟺ space a left parenthesis 1 right parenthesis squared plus b left parenthesis 1 right parenthesis plus c equals negative 9 space ⟺ a plus b plus c equals negative 9 horizontal ellipsis left parenthesis i i right parenthesis f left parenthesis 2 right parenthesis equals negative 8 space ⟺ space a left parenthesis 2 right parenthesis squared plus b left parenthesis 2 right parenthesis plus c equals 0 ⟺ 4 a plus 2 b plus c equals negative 8 horizontal ellipsis left parenthesis i i i right parenthesis  U n t u k space m e n c a r i space n i l a i space a comma b space d a n space c comma space p e r t a m a minus t a m a space a k a n space d i e l i m i n a s i space p e r s a m a a n space left parenthesis i right parenthesis space space & space left parenthesis i i i right parenthesis table row cell 4 a minus 2 b plus c equals 0 space space space space space space space space space space end cell row cell bottom enclose stack 4 a plus 2 b plus c equals negative 8 space with _ below end enclose space minus end cell row cell space space space space space space space space space space space space space space space space space space space space space space space space space space space space minus 4 b equals 8 ⟺ b equals negative 2 end cell end table K e m u d i a n space l a k u k a n space e l i m i n a s i space p a d a space p e r s a m a a n space left parenthesis i right parenthesis space space & space left parenthesis i i right parenthesis table row cell 4 a minus 2 b plus c equals 0 space space space space space space space space space space space space space space end cell row cell bottom enclose stack a plus b plus c equals negative 9 with _ below space end enclose minus end cell row cell space space space space space space space space space space space space space space space space space space space space space space space space space space space space 3 a minus 3 b equals 9 ⟺ a minus b equals 3 space space space space space space space end cell end table  K a r e n a space n i l a i space b equals negative 2 space m a k a space a minus left parenthesis negative 2 right parenthesis equals 3 ⟺ a plus 2 equals 3 ⟺ a equals 1 space L a n g k a h space t e r a k h i r space d i s u b s t i t u s i k a n space n i l a i space a equals 1 comma space b equals negative 2 space k e space p e r s a m a a n space left parenthesis i i right parenthesis space a plus b plus c equals negative 9 ⟺ 1 plus left parenthesis negative 2 right parenthesis plus c equals negative 9 ⟺ negative 1 plus c equals negative 9 ⟺ c equals negative 8 space space space  J a d i space d i d a p a t k a n space n i l a i space a equals 1 comma b equals negative 2 comma c equals negative 8 space s e h i n g g a space colon space f left parenthesis x right parenthesis equals 1 x squared minus 2 x minus 8 equals x squared minus 2 x minus 8 space

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