The sum of the first n terms of an AP is 4n ^ 2 + 5n find the common difference and the algebraic expression.
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Step-by-step explanation:
The sum of the first term = 4n^2+5n = 4+5 = 9.
The sum of the first two terms = 4n^2+5n = 16+10 = 26.
The first term being 9 the second term is 17 so common difference is 8.
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