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Which statement is correct about (x^2+\sqrt{5}x-7)?

Answer and explanation

Correct answer: It is a polynomial in (x)

The direct answer is option B: \(x^2+\sqrt5x-7\) is a polynomial in \(x\). A polynomial permits real or irrational coefficients; only the powers of the variable are restricted to non-negative whole numbers. Here \(\sqrt5\) is merely a fixed real coefficient multiplying \(x\). The powers of \(x\) are 2, 1, and 0, so the expression follows the polynomial form. Option A is wrong because \(\sqrt5\) as a coefficient does not disqualify a polynomial. Option B is correct for the reason just shown. Option C is wrong because the expression has variable terms, so it is not constant. Option D is wrong because the zero polynomial is the expression whose every coefficient is zero, whereas this expression has coefficients 1, \(\sqrt5\), and \(-7\). Memory cue: irrational coefficients are allowed; fractional or negative powers of the variable are not.

Related tags

Real-CoefficientPolynomialDefinition

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