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If (r=3), what will be the degree of ((r^2-9)x^7+(r-1)x^4+x^2)?

Answer and explanation

Correct answer: (4)

To find the degree after a value is assigned to a parameter, substitute that value into every coefficient and then remove any term whose coefficient becomes zero. The degree is the largest exponent that remains attached to a non-zero term. A high exponent alone does not determine the degree if its coefficient vanishes.

For \(r=3\), the coefficient of \(x^7\) is \(r^2-9=3^2-9=9-9=0\), so the seventh-degree term disappears. The coefficient of \(x^4\) is \(r-1=3-1=2\), which is non-zero. The term \(x^2\) also remains. Thus the resulting polynomial has highest non-zero power \(4\), making option B the correct choice.

Related tags

PolynomialDegreeParameter Substitution

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