Question

The 8 th term of an arithemetic sequenceis 12 and12 th term is 8 what is the algebraic expressionto the sequence

Answer 1

Answer:

HERE IS UR ANSWER DEAR.....!!!

8th term = a+7d = 12

12th term = a+11d= 8

by elimination method..

-4d= 4

d= -1

Sub/: d=-1 in 8th term equation...

8th term = a+7d. = 12

a+7 ( -1) = 12

a. = 12+7

a = 19

therefore.....

a= 19

d= -1

the sequence will be

a , a+d ,a+2d , a+ 3d , ......

19, 19 + (-1) ,19 +2(-1) ,19 + 3( -1).....

19,18, 17,16,......

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