Jika f(x) = 3×3 + 8×2 – x – 15, nilai f (-3) adalah

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Baiklah untuk soal selanjut nya…

Jika f(x) = 3×3 + 8×2 – x – 15, nilai f (-3) adalah

A.24

B.9

C.-11

D.-17

E.-21

Pembahasan:

f(x) = 3×3 + 8×2 – x – 15

f(-3) = 3(-3)3 + 8(-3)2 – (-3) – 15

= -81 + 72 + 3 – 15

f(-3) = -21

Jawabannya : E

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