The sum of first nth term of AP is 5(n×n)+3n is nth term is 168.Find n and 28th term of Ap

The sum of first nth term of AP is 5(n×n)+3n is nth term is 168.Find

1.	The sum of first nth term of AP is 5(n×n)+3n is nth term is 168.Find n and 28th term of Ap
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