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If \(p(x)=x^2-2x+4\), what is the polynomial expression for \(p(x+3)\)?

Answer and explanation

Correct answer: \(x^2+4x+7\)

To find \(p(x+3)\), replace every occurrence of \(x\) in the polynomial by the complete expression \((x+3)\): \(p(x+3)=(x+3)^2-2(x+3)+4=x^2+6x+9-2x-6+4=x^2+4x+7\). Hence, option A is correct. Option B results from simplifying the constant terms incorrectly. Exam tip: when substituting an expression for \(x\), place the entire expression in parentheses.

Related tags

Polynomial SubstitutionPolynomials In One VariableAlgebraic SimplificationFunction NotationPolynomialsMathematicsClass 10 Mcq

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