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If p(x) = (a − 2)x³ + 5x − 7 and a = 2, what type of polynomial will p(x) become?

Answer and explanation

Correct answer: Linear polynomial

Substitute a = 2 into the coefficient of x³. We obtain a − 2 = 2 − 2 = 0, so the cubic term becomes 0x³ and disappears. Thus p(x) = 0x³ + 5x − 7 = 5x − 7. The highest power of x with a non-zero coefficient is now 1, so p(x) is a linear polynomial. Option C is correct. It is not cubic because the coefficient of x³ is zero. It is not quadratic because no x² term is present. It is not the zero polynomial because 5x − 7 is not identically zero; for example, at x = 0 its value is -7. The degree must be determined after substitution and simplification, not from the original displayed form.

Related tags

Polynomial-DegreeSubstitutionLinear-PolynomialDefinition Of A PolynomialIntroduction To PolynomialsMathematicsClass 9 Mcq

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