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F'(x) = 3px² - 16x
Sehingga,
F'(2) = 16
16 = 3p(2)² - 16(2)
16 = 12p - 32
12p = 48
p = 4
Maka,
Nilai berikut:
= 4(1)³-8(1)²+3 + 4[3.4(1) - 16(1)] - 2(4)
= 4 - 8 + 3 + 4[12-16] - 8
= -1 + 4(-4) - 8
= -1 - 16 - 8
= -25