rot-,hind n and an

1.	rot-,hind n and an
Answer» a=2d=8Sn=90Sn=(n/2)[2a+(n-1)d]902=n[22+(n-1)8]180=n[4+8n-8]180=n[8n-4]180=4n[2n-1] 180/4=n[2n-1]45=n[2n-1]45=2n²-n2n²-n-45=02n²-10n+9n-45=02n(n-5)+9(n-5)=0(n-5)(2n+9)=0 n=5,-9/2 n must be positive integerSo, n=5 an=a+(n-1)dan=2+(n-1)8an=2+8n-8=8n-6

Answer»

a=2d=8Sn=90Sn=(n/2)[2a+(n-1)d]90*2=n[2*2+(n-1)8]180=n[4+8n-8]180=n[8n-4]180=4n[2n-1] 180/4=n[2n-1]45=n[2n-1]45=2n²-n2n²-n-45=02n²-10n+9n-45=02n(n-5)+9(n-5)=0(n-5)(2n+9)=0

n=5,-9/2

n must be positive integerSo, n=5

an=a+(n-1)dan=2+(n-1)8an=2+8n-8=8n-6

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rot-,hind n and an

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