14. Diketahui π(π₯) = π₯ β 3 dan π(π₯) = 2π₯^3 + 5π₯, maka berapakah nilai dari (π β π)(π₯)?
a. 2π₯^3 + 6π₯ β 3
b. β2π₯^3 + 6π₯ β 3
c. β2π₯^3 β 4π₯ β 3
d. β2π₯^3 + 4π₯ β 3
e. 2π₯^3 + 4π₯ β 3
Jawaban :
π(π₯) = π₯ β 3
π(π₯) = 2π₯^3 + 5π₯
(π β π)(π₯) = f(x) - g(x)
(π β π)(π₯) = x - 3 - (2π₯^3 + 5π₯)
(π β π)(π₯) = x - 3 - 2π₯^3 - 5π₯
(π β π)(π₯) = - 2π₯^3 - 4π₯ - 3
Jawaban : C
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