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If (p(x)=(a-4)x^5+3x^2-7) is to be exactly a quadratic polynomial, what is the value of (a)?

Answer and explanation

Correct answer: 4

A quadratic polynomial has highest power 2. Therefore, the coefficient of \(x^5\) must be zero: \(a-4=0\). Hence, \(a=4\). Then \(p(x)=3x^2-7\), which has degree 2 because the coefficient of \(x^2\) is the non-zero number 3. If \(a=0\), the \(x^5\) term remains, so the polynomial is not quadratic. Exam tip: in parameter-based questions, first make the coefficient of the highest unwanted power zero.

Related tags

PolynomialsQuadratic PolynomialDegree Of PolynomialParameterAlgebraDefinition Of A PolynomialIntroduction To PolynomialsMathematics

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