Advanced Math practice question

Answer: 20

x^(2/3) = (x^(1/3))² = 4 and x^(4/3) = (x^(1/3))⁴ = 16, so the sum is 20.

Common wrong answers

If you answered 6

6 adds 2 + 4, using x^(1/3) and x^(2/3) instead of the two powers asked for.

If you answered 12

12 comes from x^(4/3) = 8 (cubing instead of raising to the fourth).

If you answered 24

24 is 8 + 16, using x = 8 for x^(2/3).

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