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Which expression is not a polynomial in x because the variable has power 7/3?

Answer and explanation

Correct answer: x^(7/3) + 2x − 5

The definition of a polynomial in x permits only non-negative integer powers of x, such as 0, 1, 2, 3 and so on. Option B contains x^(7/3), whose exponent is fractional rather than an integer. Therefore it does not satisfy the polynomial definition, even though the other terms 2x and −5 are acceptable. Option A has exponents 7, 1 and 0, so it is a polynomial. Option C has exponents 3 and 0, and option D has exponents 1 and 0; both are also valid polynomials. The coefficients may be fractional or irrational without causing a problem, but a fractional exponent of the variable is not allowed. Hence option B is uniquely correct.

Related tags

Definition Of PolynomialFractional ExponentNon-PolynomialDefinition Of A PolynomialIntroduction To PolynomialsMathematicsClass 9 Mcq

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