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If 2^x = 3, what is the value of 8^x?

Answer and explanation

Correct answer: 27

The governing concept is the law of exponents, especially (a^m)^n = (a^n)^m and the ability to rewrite a number using a known base. Since 8 = 2^3, we can write 8^x = (2^3)^x = (2^x)^3. The given relation is 2^x = 3, so substitution gives 8^x = 3^3 = 27. Hence option A is correct. The answer 9 would incorrectly use a square instead of a cube. The value 24 does not follow from any applicable exponent law, and 6 incorrectly multiplies the known value by 2 rather than raising it to the third power. The calculation uses only the stated relation and valid power rules.

Related tags

ExponentsPower-LawsAlgebraic-ManipulationOperations On Real Numbers And The Laws Of ExponentsPolynomialsMathematicsClass 10 Mcq

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