Asked by favour

in an ap the 10thterm is 68 while it 4th term is 26 find the common different and the ist term
Answered by mathhelper
How about just using our definitons
"the 10thterm is 68" ----> a + 9d = 68
"the 4th term is 26 " ----> a + 3d = 26
subtract them:
6d = 42
d = 7
back in a + 3d = 26
a + 21 = 26
a = 5

btw, Its called common difference, not different.
Answered by R_scott
six differences between 4th and 10th ... d = (68 - 26) / (10 - 4)

1st = 4th - 3 d
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