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If \(p(x)=x^2-4x+k\) and \(p(1)=p(3)\), what can be said about \(k\)?

Answer and explanation

Correct answer: Any real value

Substituting the given values gives \(p(1)=1^2-4(1)+k=k-3\) and \(p(3)=3^2-4(3)+k=k-3\). Thus the two values are equal for every real \(k\), so there is no further restriction on \(k\). Therefore, \(k\) can be any real value. Exam tip: Evaluate the polynomial at both specified inputs before trying to solve for the parameter.

Related tags

PolynomialsPolynomial EvaluationParameter ValuesQuadratic PolynomialsPolynomials In One VariableMathematicsClass 10 Mcq

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