Question

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

Answer 1

Hey user here is your answer....

---->To find. - a
.
◆An=a+(n-1)d
.
◆a7=4
◆a+(7-1)d=4

◆a+6d=4

Put value of d here

◆a+6(-4)=4

◆a-24=4
◆a=4+24
◆a=28


Thanks☺️

#Rohan

Answer 2

a+(n-1)d=4.
a+6d=4
a+6(-4)=4
a=4+24
a=28.