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Which expression is not a polynomial because the variable is inside a radical sign?

Answer and explanation

Correct answer: sqrt(x + 1) + 2

In a polynomial in x, the variable may appear only with non-negative integer powers. In option C, sqrt(x + 1) places x inside a square root; algebraically this involves the fractional power (x + 1)^(1/2), so it does not satisfy the polynomial definition. The other radicals contain numerical constants only. In option A, sqrt(2) is a real coefficient multiplying x; in option B, -sqrt(5) is a constant term; and in option D, sqrt(7) is the coefficient of x. Irrational real coefficients are allowed in polynomials. Thus the presence of a radical is not automatically disqualifying; what matters is whether the variable occurs inside it. Hence option C is correct.

Related tags

PolynomialRadicalNon-PolynomialDefinition Of A PolynomialIntroduction To PolynomialsMathematicsClass 9 Mcq

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