the sum of first n terms of an ap is given by n^2+8n.find and d and al

1.	the sum of first n terms of an ap is given by n^2+8n.find and d and also find the sum of the terms of 50 terms
Answer» ONG>Step-by-step EXPLANATION: If n=1, then: S1=a=> (1)²+8×1 => 1+8=9. If n=2, then: S2=> (2)²+8×2 => 4+16=20. A2=S2-S1=> 20-9=11. d=a2-a=11-9=3. If n=50, then: S50=> (50)²+8×50 => 2500+400 => 2900.

the sum of first n terms of an ap is given by n^2+8n.find and d and also find the sum of the terms of 50 terms

Answer» ONG>Step-by-step EXPLANATION:

If n=1, then:

S1=a=> (1)²+8×1

=> 1+8=9.

If n=2, then:

S2=> (2)²+8×2

=> 4+16=20.

A2=S2-S1=> 20-9=11.

d=a2-a=11-9=3.

If n=50, then:

S50=> (50)²+8×50

=> 2500+400

=> 2900.

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the sum of first n terms of an ap is given by n^2+8n.find and d and also find the sum of the terms of 50 terms​

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the sum of first n terms of an ap is given by n^2+8n.find and d and also find the sum of the terms of 50 terms