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If \(p(x)=3x^2-2x+5\), what is the simplified form of \(p(2x)\)?

Answer and explanation

Correct answer: \(12x^2-4x+5\)

To find \(p(2x)\), substitute \(2x\) for every occurrence of \(x\): \(p(2x)=3(2x)^2-2(2x)+5=12x^2-4x+5\). Hence, option A is correct. In option B, the term \(3(2x)^2\) has incorrectly been treated as \(6x^2\). Exam tip: when squaring \(2x\), square the entire expression, so \((2x)^2=4x^2\).

Related tags

SubstitutionPolynomial FunctionsAlgebraic SimplificationPolynomials In One VariablePolynomialsMathematicsClass 10 Mcq

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