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What is the degree of the polynomial p(x) = 4x^3 − 2x + 9?

Answer and explanation

Correct answer: 3

Answer: option A, 3. The degree of a non-zero polynomial in one variable is the greatest exponent of the variable having a non-zero coefficient. In p(x)=4x³−2x+9, the term 4x³ has exponent 3 and coefficient 4, which is non-zero. The term −2x has exponent 1, and the constant 9 has exponent 0. Since 3 is the greatest exponent present with a non-zero coefficient, the degree is 3. Option B is not correct because the x² term is missing; a missing term has coefficient zero and does not determine the degree. Option C is the degree of only the linear term −2x. Option D is the constant’s value, not the degree. A helpful rule is to arrange terms by powers and select the highest non-zero power, not the largest numerical coefficient.

Related tags

DegreePolynomialsOne-VariableHighest-PowerPolynomials In One VariableMathematicsClass 10 Mcq

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