Diketahui fungsi f(x) = x2 – 4x + 7 dan g(x) = 2x – 5. Nilai (f – g)(3) =
Diketahui fungsi f(x) = x2 – 4x + 7 dan g(x) = 2x – 5. Nilai (f – g)(3) = ….
A. 2
B. 3
C. 4
D. 5
E. 6
Pembahasan:
f(x) = x2 – 4x + 7 dan g(x) = 2x – 5
(f – g)(x) = x2 – 4x + 7 – (2x – 5)
= x2 – 4x + 7 – 2x + 5
(f – g)(x) = x2 – 6x + 12
(f – g)(3) = 32 – 6(3) + 12
= 9 – 18 + 12
(f – g)(3) = 3
Jawaban: B
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