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Which expression is not a polynomial because the variable occurs in the exponent?

Answer and explanation

Correct answer: 3^x + x^2

In a polynomial in x, x may appear as the base raised to a fixed non-negative integer power. Coefficients must be constants with respect to x. Option B contains 3^x, where x is in the exponent and the base 3 is constant. This is an exponential term, not a polynomial term, so the whole expression is not a polynomial in x. Therefore option B is correct. The additional term x² in option B does not remove the invalid exponential term. Option A has powers 3 and 1, option C has x⁰ and a constant, and option D has powers 5 and 1. All their variable exponents are fixed non-negative integers. The distinction is important: x^3 is polynomial, whereas 3^x is exponential.

Related tags

Definition-Of-PolynomialVariable-ExponentExponential-ExpressionIntroduction To PolynomialsMathematicsClass 9 McqDefinition Of A Polynomial

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