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Which expression is not a polynomial because of √x?

Answer and explanation

Correct answer: √x + 2x

The governing concept is the definition of a polynomial in x. Every exponent of x must be a non-negative integer, although coefficients may be irrational constants. In option C, √x can be written as x^(1/2), and 1/2 is not an integer. Therefore √x + 2x is not a polynomial in x, making option C correct. In option A, √2 is only a constant coefficient, so x² + √2 is a valid polynomial of degree 2. Similarly, √5 is a constant coefficient in option B, which is a valid linear polynomial. Option D, 7x³ − 1, is also valid and has degree 3. Thus the radical involving the variable, rather than a radical constant, causes the failure.

Related tags

Polynomial DefinitionRadical ExpressionNon-Integer ExponentDefinition Of A PolynomialIntroduction To PolynomialsMathematicsClass 9 Mcq

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