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Which option is a quadratic polynomial in x?

Answer and explanation

Correct answer: 3x² − πx + √7

A polynomial in x has only non-negative integer powers of x, and a quadratic polynomial has highest power exactly 2. Option A is 3x²−πx+√7. Its x-powers are 2, 1 and 0, so it meets the polynomial definition and has degree 2. The coefficients π and √7 are real numbers, and irrational coefficients are allowed; they do not change the degree. Hence option A is the required quadratic polynomial. Option B has highest power 3 and is cubic. Option C contains x^(1/2), a fractional power, so it is not a polynomial. Option D contains 1/x=x^−1, a negative power, and is also not a polynomial. Thus the degree and exponent rules identify A unambiguously.

Related tags

PolynomialQuadratic-PolynomialDegreeDefinition Of A PolynomialIntroduction To PolynomialsMathematicsClass 9 Mcq

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