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For which value of k will x^k + 2x - 5 be a polynomial in x?

Answer and explanation

Correct answer: k = 4

The defining rule for a polynomial in x is that every exponent of x must be a fixed non-negative integer: 0, 1, 2, 3, and so on. The coefficients may be real numbers, but negative and fractional powers of the variable are not allowed. In x^k + 2x - 5, the powers in the last two terms are 1 and 0, so only k needs to be tested. For k = -1 or k = -4, x has a negative exponent and would occur in a denominator. For k = 1/2, the exponent is fractional and gives a square-root type term. When k = 4, the expression becomes x^4 + 2x - 5, with powers 4, 1, and 0. Thus option C is the only valid answer.

Related tags

Definition-Of-PolynomialExponentsParameterDefinition Of A PolynomialIntroduction To PolynomialsMathematicsClass 9 Mcq

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