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If (a=5) in (p(x)=2x^4+(a-5)x^2+3x-1), which statement is correct?

Answer and explanation

Correct answer: The degree of the polynomial will remain 4

On substituting a=5, the coefficient of (a-5)x^2 becomes 0, so the x^2 term disappears. Thus, p(x)=2x^4+3x-1. The highest exponent of x with a non-zero coefficient is 4, so the degree remains 4. Option A is incorrect because the x^4 term is still present. Exam tip: remove terms with zero coefficients before identifying the highest power.

Related tags

PolynomialsDegree Of PolynomialParameter SubstitutionZero CoefficientClass 9 MathematicsDefinition Of A PolynomialIntroduction To PolynomialsMathematics

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