Diketahui:
rumus fungsi (fx)= px + q
f(3) = 16
f(-3) = -26
Ditanya: nilai f(-4)
Jawab:
f(x) = px + q
f(3) = 16 ---> 3p + q = 16
f(-3) = -26---> -3p+q = -26 _
6p = 42
p = 42/6 = 7
substitusi nilai p = 7 ke persamaan 3p + q = 16
3.7 + q = 16
21 + q = 16
q = 16-21
q = -5
Didapatkan nilai p = 7 dan nilai q = -5
rumus f(x) = px + q
f(x) = 7x + (-5)
f(x) = 7x -5
Nilai f(-4) = 7.(-4) -5
= -28 -5
= -33
Semoga membantu
Detil tambahan:
Kelas: VIII SMP
Mapel: Matematika
Materi: BAB II- Fungsi
Kode: 2
Kode kategorisasi: 8.2.2
Kata kunci: Fungsi
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Diketahui:
rumus fungsi (fx)= px + q
f(3) = 16
f(-3) = -26
Ditanya: nilai f(-4)
Jawab:
f(x) = px + q
f(3) = 16 ---> 3p + q = 16
f(-3) = -26---> -3p+q = -26 _
6p = 42
p = 42/6 = 7
substitusi nilai p = 7 ke persamaan 3p + q = 16
3.7 + q = 16
21 + q = 16
q = 16-21
q = -5
Didapatkan nilai p = 7 dan nilai q = -5
rumus f(x) = px + q
f(x) = 7x + (-5)
f(x) = 7x -5
Nilai f(-4) = 7.(-4) -5
= -28 -5
= -33
Semoga membantu
Detil tambahan:
Kelas: VIII SMP
Mapel: Matematika
Materi: BAB II- Fungsi
Kode: 2
Kode kategorisasi: 8.2.2
Kata kunci: Fungsi