Question

In an AP, if the common difference (d)= -4, and the seventh term (a7) is 4 ,then what us first term

Answer 1

A7=4,d=-7
A7=a+6d
4=a+6(-4)
4=a-24
4+24=a
28=a

Hence first term of AP:28

Answer 2

the answer of this question is see in photo.