Question

in an AP the common difference D and 7 term is 4 then find first term

Answer 1

7th term = a+6d

4 = a+(6*4)

4 =a+24

4-24 =a

-20 =a

First term is -20


I hope this will help you

-by ABHAY

Answer 2

a7 = a + (n-1)d
4= a + 6 ×4
4=a + 24
a = -20