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If \(3^{x+1}=81\), what is the value of \(x\)?

Answer and explanation

Correct answer: 3

Since \(81=3^4\), the equation becomes \(3^{x+1}=3^4\). Because the bases are equal and positive, their exponents must be equal: \(x+1=4\), so \(x=3\). Option C is a common error because substituting \(x=4\) gives an exponent of \(5\), not \(4\). Exam tip: Express both sides with the same base before equating the exponents.

Related tags

PolynomialsExponentsExponential EquationsReal NumbersOperations On Real Numbers And The Laws Of ExponentsMathematicsClass 10 Mcq

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