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Which statement is correct about (x^0+x^{-1}+2)?

Answer and explanation

Correct answer: It is not a polynomial because it has (x^{-1})

The correct answer is C: the expression is not a polynomial because it contains x^{-1}. A polynomial is a sum of terms in which the variable has a whole-number exponent 0, 1, 2, 3, and so on; negative exponents are not allowed. Here x^0=1, so that part is valid, and 2 is also a constant. However, x^{-1}=1/x has a negative exponent and places x in the denominator. One invalid term makes the whole expression non-polynomial. Option A is wrong because the presence of x^0 alone is not enough. Option B is wrong because the expression still contains x^{-1}, so it is not constant. Option C correctly identifies the decisive restriction. Option D is wrong because the expression is not a polynomial at all, and it does not consist only of a highest power x^2. Memory cue: denominator or negative exponent means not a polynomial.

Related tags

Definition-PolynomialNegative-PowerZero-Power

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