Question

in an ap, if the common difference (d) =-4 and the 7th term (a7) is 4, then find the first term

Answer 1

a7= a+6d
4=a+6*-4
4= a+(-24)
4+24=a
28=a

hope it helps
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Answer 2

Hy mate your answer is here,
Since, d = -4
a7 = 4
a+(n-1)d = 4
a+(7-1)×-4 = 4
a+6×-4 = 4
a-24 = 4
a = 4+24
a = 28
Hope it may help you ..