Question

in an AP if difference is -4 and a7=4 then fine the first term

Answer 1

here d = -4 and a7 = 4
tn= a+(n-1)d
for n=7 we get
t7=a+(7-1)(-4)
4=a-24
a=24+4
a=28
hence required first term is 28

Answer 2

Hi Mate!!

a7 = a + 6d

Where d is common difference and a is ist term

d = -4. and a7 = 4

=>. 4 = a + 6 ( -4 )

=>. a = 28