Tentukan nilai f(3) – 2f(4) jika f(x) = x2 -2x-17
Jawaban Terkonfirmasi
F(x) = x² – 2x – 17
f(3) = 3² – 2×6 – 17
f(3) = 9 – 12 -17
f(3) = -20
2f(4) = 4² – 2×8 – 17
2f(4) = 16 – 16 – 17
2f(4) = -17
2f(4) = 2 × (-17)
2f(4) = -34
f(3) – 2f(4)
= -20 – (-34)
= 14