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Pertanyaan

Jika diketahui f left parenthesis straight x right parenthesis equals 2 straight x squared plus straight x, maka nilai dari straight f left parenthesis straight x space minus space 3 right parenthesis adalah...

  1. negative space 2 straight x squared space plus space 11 straight x space minus space 15

  2. negative space 2 straight x squared space minus space 11 straight x space plus space 15

  3. 2 straight x squared space plus space 11 straight x space minus space 15

  4. 2 straight x squared space minus space 11 space plus space 15

  5. 2 straight x squared space minus space 11 straight x space minus space 15

N. Mustikowati

Master Teacher

Mahasiswa/Alumni Universitas Negeri Jakarta

Jawaban terverifikasi

Pembahasan

straight f left parenthesis straight x right parenthesis equals space 2 straight x squared space plus space straight x  straight f left parenthesis straight x minus 3 right parenthesis equals 2 left parenthesis straight x minus 3 right parenthesis squared space plus left parenthesis straight x minus 3 right parenthesis  equals 2 left parenthesis straight x squared minus 6 straight x plus 9 right parenthesis space plus straight x minus 3  equals 2 straight x squared minus 12 straight x plus 18 straight x minus 3  equals 2 straight x squared minus 11 straight x plus 15

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Jika f fungsi yang memenuhi  persamaan f(1)=4 dan f(x+1)=2f(x). Tentukanlah f(2021).

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