SOLUTION: 4th and 7th term of an AP are 9 and 21 respectively. Find the 1st eight terms of the sequence
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Question 858064: 4th and 7th term of an AP are 9 and 21 respectively. Find the 1st eight terms of the sequence
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
an = a + (n - 1)d
21= a + 6d
9 = a + 12
12=3d
d=4
a=-3
-3+4=1 etc
-3,1,5,9,13,17,21,25
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