Hitunglah f(3) jika f(x) = 2x3 + 4x2 – 18
Hitunglah f(3) jika f(x) = 2x3 + 4x2 – 18!
Jawab:
f(x) = 2x3 + 4x2 – 18
f(3) = 2(3)3 + 4(3)2 – 18
= 2 × 27 + 4 × 9 – 18
= 54 + 36 – 18
f(3) = 72
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