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If (a_1=9) and (a_{n+1}=a_n+a_1+n^2), what is (a_3)?

Answer and explanation

Correct answer: \(32\)

Given \(a_1=9\), first use \(n=1\) in the recursive rule: \(a_2=a_1+a_1+1^2=9+9+1=19\). Next, use \(n=2\): \(a_3=a_2+a_1+2^2=19+9+4=32\). Hence, the correct answer is \(32\). A choice such as \(34\) can result from an error in using the square term or the previous term. Exam tip: substitute the correct value of \(n\) at every step of a recurrence relation.

Related tags

Recursive SequencesRecurrence RelationSequence TermsClass 9 MathematicsAlgebraRecursive RuleSequences And ProgressionsMathematics

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