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Which expression is a polynomial in x and has degree 3?

Answer and explanation

Correct answer: −4x³ + √5x + 8

A polynomial in x may have real coefficients, including the irrational coefficient √5, but every exponent of x must be a non-negative integer. Option C has powers 3, 1, and 0, so it is a polynomial and its greatest power is 3. Option A has x in the denominator, option B has degree 2, and option D has a fractional exponent.

Related tags

PolynomialCubicDegreeIrrational-CoefficientDefinition Of A PolynomialIntroduction To PolynomialsMathematicsClass 9 Mcq

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