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What is the simplified form of \(\frac{(2^3)^2\cdot4^{-1}}{8}\)?

Answer and explanation

Correct answer: 2

The governing concept is the law of exponents: \((a^m)^n=a^{mn}\), negative exponents represent reciprocals, and division by a power subtracts its exponent. Rewrite every quantity with base 2. We have \((2^3)^2=2^6\), \(4^{-1}=(2^2)^{-1}=2^{-2}\), and \(8=2^3\). Therefore the expression is \(2^6\cdot2^{-2}\div2^3=2^{6-2-3}=2^1=2\). Hence option A is correct. A common error is to treat \(4^{-1}\) as 4 or to add the denominator exponent instead of subtracting it. Options B, C and D reflect such exponent or reciprocal mistakes.

Related tags

Laws-Of-ExponentsNegative-ExponentsSimplificationOperations On Real Numbers And The Laws Of ExponentsPolynomialsMathematicsClass 10 Mcq

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