Jika f(x) = (1 + 4x) · (2 – x) maka 6. f'(1) + f'(-1) =A 10D. 7B. 9E 17C. 8​

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Jika f(x) = (1 + 4x) · (2 – x) maka 6. f'(1) + f'(-1) =A 10D. 7B. 9E 17C. 8​

Jawaban:

B. 9

Penjelasan dengan langkah-langkah:

(1 + 4x) · (2 – x) = -4x^2 + 7x + 2

f'(x) = -8x +7

f'(1) = -8(1)+7 = -1

f'(-1) = -8(-1)+7 = 15

6 f'(1) + f'(-1) = 6(-1) + 15 = 15-6 = 9