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If (27^{x}=9), then (x=)?

Answer and explanation

Correct answer: \(\frac{2}{3}\)

Express both numbers as powers of 3: \(27=3^3\) and \(9=3^2\). Thus, \(27^x=9\) becomes \((3^3)^x=3^2\), so \(3^{3x}=3^2\). Since the bases are equal, their exponents must be equal: \(3x=2\), giving \(x=\frac{2}{3}\). Therefore, option A is correct. Option B, \(\frac{3}{2}\), results from reversing the comparison of the exponents. Exam tip: Rewrite both sides with the same base before comparing exponents.

Related tags

ExponentsNumber SystemsPowersEquationsClass 9MathematicsClass 9 Mcq

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