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If \(p(x)=x^2-8x+15\), what is the simplified form of \(p(x)-p(3)\)?

Answer and explanation

Correct answer: \(x^2-8x+15\)

First evaluate \(p(3)\): \(p(3)=3^2-8(3)+15=9-24+15=0\). Therefore, \(p(x)-p(3)=p(x)-0=x^2-8x+15\), so option A is correct. Option B results from the common error of taking \(p(3)=3\) instead of evaluating the polynomial. In an exam, substitute the given value into every occurrence of the variable before simplifying.

Related tags

Polynomial EvaluationFunction SubstitutionAlgebraic SimplificationPolynomials In One VariablePolynomialsMathematicsClass 10 Mcq

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