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If r = 0, what is the degree of (r^2 - r)x^3 + (r + 2)x^2 + 1?

Answer and explanation

Correct answer: 2

To determine the degree correctly, first substitute the given value of the parameter r. When r = 0, the coefficient of x^3 is r^2 - r = 0^2 - 0 = 0, so the entire cubic term vanishes. The coefficient of x^2 is r + 2 = 0 + 2 = 2. The expression therefore becomes 2x^2 + 1. Its greatest power of x with a non-zero coefficient is 2, so its degree is 2 and option B is correct. Option C ignores the zero coefficient of x^3. Option D incorrectly adds powers, while option A would describe a non-zero constant, not the remaining quadratic expression.

Related tags

PolynomialDegreeParameter-SubstitutionDegree Of A PolynomialIntroduction To PolynomialsMathematicsClass 9 Mcq

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