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A student says that the degree of the polynomial \(7-2x+x^4\) is 3 because it has three terms. What is the error in the student's statement?

Answer and explanation

Correct answer: Degree is not the number of terms; it is the highest power of the variable, so the degree is 4.

The degree of a polynomial is not determined by the number of terms. It is the greatest exponent of the variable with a non-zero coefficient. In \(7-2x+x^4\), the exponents of \(7\), \(-2x\), and \(x^4\) are 0, 1, and 4 respectively, so the degree is 4. Option C gives an exponent sum of 5, but adding exponents is not the rule for finding degree. Exam tip: simplify the polynomial, then identify the highest power of the variable.

Related tags

PolynomialsDegree Of PolynomialClass 9 MathematicsExponentsMisconception CheckDegree Of A PolynomialIntroduction To PolynomialsMathematics

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