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If (q(x)=(k^2-9)x^6+(k-3)x^4+2x^2) and (k=3), what is the degree of (q(x))?

Answer and explanation

Correct answer: 2

On substituting \(k=3\), we get \(k^2-9=9-9=0\) and \(k-3=0\). Thus, the \(x^6\) and \(x^4\) terms vanish, leaving \(q(x)=2x^2\). Its highest power of \(x\) is 2, so the degree is 2. Option 6 may seem tempting from the original expression, but its coefficient becomes zero when \(k=3\). Exam tip: substitute the parameter value and remove zero-coefficient terms before finding the degree.

Related tags

PolynomialsDegree Of PolynomialParameter SubstitutionAlgebraClass 9 MathematicsDegree Of A PolynomialIntroduction To PolynomialsMathematics

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