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Which expression is a polynomial with real coefficients and an irrational coefficient?

Answer and explanation

Correct answer: (\sqrt{7}x^4-3x+2)

The direct answer is B, √7x⁴−3x+2. A polynomial may have real coefficients such as integers, fractions, or irrational real numbers, provided the powers of the variable are non-negative integers. In option B, √7 is an irrational but real coefficient, and the powers of x are 4 and 1, while the constant term has power 0. Thus it satisfies both requirements. Option A contains √x=x^(1/2), whose exponent is not a non-negative integer, so it is not a polynomial. Option C contains x^(−2), a negative power, so it is not a polynomial, even though √7 is a valid coefficient. Option D contains 1/x=x^(−1), also a negative power. Option B is therefore the only expression with the required form. Memory cue: irrational coefficients are allowed; fractional or negative exponents of the variable are not.

Related tags

Definition-PolynomialIrrational-CoefficientReal-Coefficients

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