in an Arithmetic progression the 3rd term is -5 and 7th term is 9 then common difference is
Answers
Answered by
1
a3=-5
a7=9
a+2d=-5
a+6d=9
-4d=-14
d=-14/-4
d=7/2
Answered by
1
d = 7/2
a3 = -5
(a+2d)=-5.......(i)
a7 = 9
(a + 6d)=9.......(ii)
from(i)
a+2d=-5
a= -5-2d
place the value of a in (ii)
a+6d= 9
-5-2d+6d=9
-2d+6d=9+5
4d=14
d=14/4
d=7/2
Similar questions