an A.P. , if the common difference (d) = -4 and the seventh term (a7) is 4 , then find the first term. *
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It is simple I will show you how it is,
a7= 4
d= -4
So we know the the equation:
An= a+ (n-1)d
4 = a+ (7-1) x -4
4 = a+ 6 x-4
4 = a - 24
a = -4+24
a = 20
AP= 20, 16, 12, 8............
I hope this answer will help for more understanding
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