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Find (16^{3/4}).

Answer and explanation

Correct answer: 8

Using the law of fractional exponents, first take the fourth root of 16 and then cube the result: \(16^{3/4}=(16^{1/4})^3=2^3=8\). Therefore, option C is correct. Option A is only the fourth root \(16^{1/4}\), so it misses the cubing step. Exam tip: for \(a^{m/n}\), take the nth root first and then raise it to the mth power.

Related tags

Number SystemsExponentsFractional ExponentsPowersClass 9MathematicsClass 9 Mcq

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