Which of the following is NOT a polynomial?
A3x² + 5x + 1
B2x − 7
Cx³ + 4
Dx² + 1/x
Answer & Solution
Correct answer: D. x² + 1/x
In a polynomial, the variable appears only with non-negative integer powers. The term 1/x = x⁻¹ has a negative exponent, so x² + 1/x is NOT a polynomial. The others have only non-negative integer powers of x.
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