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Which expression is a polynomial with an irrational constant term?

Answer and explanation

Correct answer: (2x^3-5x+\sqrt{7})

The correct answer is C: 2x^3-5x+√7 is a polynomial with an irrational constant term. The number √7 is irrational, but it does not contain x, so it is simply a constant coefficient; irrational constants are allowed in polynomials. The powers of x are 3 and 1, both non-negative integers, and the constant term has power 0. Option A is wrong because √x means x^{1/2}, a fractional power. Option B is wrong because x^{-2} has a negative exponent, even though √3 is an allowed constant. Option C satisfies every condition and √7 is irrational. Option D is wrong because 1/x=x^{-1}, a negative power. Thus irrationality of a coefficient is not the problem; the exponent of the variable is what matters. Memory cue: irrational constant allowed, irrational or negative power of x not allowed.

Related tags

Definition-PolynomialIrrational-ConstantReal-Coefficients

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