if an AP, if the common difference (d) -4 and the seventh term A7 is 4 then find the first term

if an AP, if the common difference (d) -4 and the seventh term A7 is 4

1.	if an AP, if the common difference (d) -4 and the seventh term A7 is 4 then find the first term
Answer» D = -4A7 =4 = AnAn = a+ (n-1)d4=a+(7-1)-44= a+(6)-44= a-24a=4+24a=28 a1= 28