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Pertanyaan

Misalkan f ( x ) = x 4 + 2 x 3 − 7 x 2 + a x + b . Jika f ( − 3 ) = f ( 1 ) , maka a = ...

Misalkan . Jika , maka 

  1. –10

  2. –9

  3. –8

  4. 6

  5. Tidak dapat ditentukan
     

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I. Roy

Master Teacher

Mahasiswa/Alumni Universitas Negeri Surabaya

Jawaban terverifikasi

Pembahasan

Maka

f left parenthesis x right parenthesis equals x to the power of 4 plus 2 x cubed minus 7 x squared plus a x plus bf open parentheses negative 3 close parentheses equals open parentheses negative 3 close parentheses to the power of 4 plus 2 open parentheses negative 3 close parentheses cubed minus 7 open parentheses negative 3 close parentheses squared plus a open parentheses negative 3 close parentheses plus bspace space space space space space space space space space equals space 81 minus 54 minus 63 minus 3 a plus bspace space space space space space space space space space equals negative 36 minus 3 a plus bf open parentheses 1 close parentheses equals open parentheses 1 close parentheses to the power of 4 plus 2 open parentheses 1 close parentheses cubed minus 7 open parentheses 1 close parentheses squared plus a open parentheses 1 close parentheses plus bspace space space space space space space equals 1 plus 2 minus 7 plus a plus bspace space space space space space space equals negative 4 plus a plus b

Maka

space space space space space space space space space space space space space space space f open parentheses negative 3 close parentheses equals f open parentheses 1 close parentheses minus 36 minus 3 a plus b equals negative 4 plus a plus b space space space space space space space space space space space space space space space space minus 4 a equals 32 space space space space space space space space space space space space space space space space space space space space space space space a equals negative 8

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Pertanyaan serupa

Polinomial 4 + 2 x − 7 x 2 + k x 3 bernilai 4 apabila x = 2 ,dengan demikian nilai k = ....

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