Tunjukkan bahwa untuk setiap x bilangan real, fungsi f(x) =
![\sqrt[3]{1 - x}](https://tex.z-dn.net/?f=+%5Csqrt%5B3%5D%7B1+-+x%7D+ "\sqrt[3]{1 - x}")
selalu turun
selalu turun
GoldenRatio
![f(1) = \sqrt[3]{1 - 1} = \sqrt[3]{0} \\ f(2) = \sqrt[3]{1 - 2} = \sqrt[3]{ - 1} \\ f(3) = \sqrt[3]{1 - 3} = \sqrt[3]{ - 2}](https://tex.z-dn.net/?f=f%281%29+%3D++%5Csqrt%5B3%5D%7B1+-+1%7D+%3D++%5Csqrt%5B3%5D%7B0%7D++%5C%5C+f%282%29+%3D++%5Csqrt%5B3%5D%7B1+-+2%7D+%3D++%5Csqrt%5B3%5D%7B+-+1%7D++%5C%5C+f%283%29+%3D++%5Csqrt%5B3%5D%7B1+-+3%7D+%3D++%5Csqrt%5B3%5D%7B+-+2%7D+ "f(1) = \sqrt[3]{1 - 1} = \sqrt[3]{0} \\ f(2) = \sqrt[3]{1 - 2} = \sqrt[3]{ - 1} \\ f(3) = \sqrt[3]{1 - 3} = \sqrt[3]{ - 2}")
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