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If the \(n\)th term of an arithmetic progression is \(a_n=4n-7\), which correctly identifies its first term and common difference?

Answer and explanation

Correct answer: First term \(-3\) and common difference \(4\)

Putting \(n=1\) gives \(a_1=4(1)-7=-3\). The coefficient of \(n\) is 4, so each successive term increases by 4; hence the common difference is 4. Exam tip: always verify the first term using \(n=1\).

Related tags

Arithmetic ProgressionNth TermCommon DifferenceFirst TermClass 10 MathematicsFinding The $N$Th Term Of An ApFinding The N Th Term Of An ApArithmetic Progressions (Ap)

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