Question

The sum of the first n terms of an arithmetic sequence is Sn = bn – 2n. Find b if
the tenth term is -16.​

Answer 1

Answer:

b= -14

Step-by-step explanation:

tn = sn-sn-1

-16 = b-2

b=-14

Answer 2

Answer:

0.4

Step-by-step explanation:

Sn=bn-2n

S10=b10-2.10=-16

     =b10=20-16

     =b10=4

     =b=4/10=0.4

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