Question

If the sum of first n term of an AP is given by Sn = 6n+7n². Then find nth term of the AP, also find 10th term of the AP

Answer 1

1. Step-by-step explanation:
2. Sn=6n+7n2

• a1=S1=6*1+7+1^2
• =6+7=13

1. S2=a2=6*2+7*2^2

• 12+7*4=12+28=40
• d=a2-a1=40-13=27
• An=a+(n-1)d
• a10=13+(10-1)27
• 13+9*27=13+243=256