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If \(p(x)=(k-3)x^5+2x^3-x+9\) has degree \(3\), what is the value of \(k\)?

Answer and explanation

Correct answer: \(3\)

For the polynomial to have degree 3, the coefficient of \(x^5\) must be zero so that the fifth-degree term disappears. Thus, \(k-3=0\), giving \(k=3\). The polynomial then becomes \(2x^3-x+9\), whose degree is indeed 3. Exam tip: set the coefficient of every term with a degree higher than the required degree to zero; for \(k=2\), the degree would remain 5.

Related tags

Degree Of PolynomialPolynomial ParameterLeading CoefficientPolynomials In One VariablePolynomialsMathematicsClass 10 Mcq

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