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Which expression is not a polynomial because (x) is hidden in the denominator?

Answer and explanation

Correct answer: \(\frac{x^2+4}{x^2}\)

The direct answer is B. A polynomial may contain addition, constants and terms such as x² or x/2, but the variable cannot have a negative exponent. In option B, (x²+4)/x²=1+4/x²=1+4x^(−2), for x≠0. The term x^(−2) shows that x is effectively in the denominator, so the expression is not a polynomial. Option A, x²+x/2, is a polynomial: x/2=(1/2)x and its exponent is 1. Option B is correct because its denominator contains x² and produces a negative power. Option C, 4x²+1, is plainly a polynomial with non-negative integer powers. Option D, x⁰+3x=1+3x, is also a polynomial; x⁰ is allowed and equals 1. A common mistake is to think every fraction is non-polynomial; a fraction such as x/2 is allowed because the denominator is only a constant.

Related tags

Definition-PolynomialHidden-DenominatorNot-Polynomial

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