Question

In an Ap if the common difference (d)=-4 and the seventh term a7 is 4 then find the first term

Answer 1

Here, d =-4

T7=4

let a be the first term.

therefore, a + 6d = 4
a + 6×(-4) =4
a=4 +24
a=28 Ans.

I think this is what u want!!!☺️☺️☺️☺️

Answer 2

d=-4 ----->eq 1
a7=a+6d=4 ----->eq 2
put d in eq 2....we get...
a+6(-4)=4
a-24=4
a=28...
hope this helps.....