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If (p(x)=x+a) and (p(p(2))=10), what is the value of (a)?

Answer and explanation

Correct answer: 4

Given \(p(x)=x+a\), we get \(p(2)=2+a\). Therefore, \(p(p(2))=p(2+a)=(2+a)+a=2+2a\). Hence \(2+2a=10\), so \(2a=8\) and \(a=4\). Option 8 may result from the mistake of concluding \(a=8\) from \(2a=8\). Exam tip: For a composite function, evaluate the inner function first and substitute its result into the outer function.

Related tags

PolynomialsLinear PolynomialsComposite FunctionsFunction EvaluationAlgebraIntroduction To PolynomialsMathematicsClass 9 Mcq

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