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f ' (x) = 2(x² - 4)^(-1/3) + 2x(-1/3)(x² - 4)^(-4/3)
f ' (2√2) = 2((2√2)² - 4)^(-1/3) + 2(2√2)(-1/3)((2√2)² - 4)^(-4/3)
= 2(8 - 4)^(-1/3) + 4√2(-1/3)(8 - 4)^(-4/3)
= 2(4)^(1/3) - 4√2(2)^(-4/3)
3
= 2∛4 - 4√2
3∛16
= 6∛64 - 4√2
3∛16
= 24 - 4√2
3∛16