Question

In Ap 10th term is 40 and 8th term is 80then the value of a​

Answer 1

a10= a+9d

40= a+9d

a= 40-9d

a8= a+7d

80= a+7d

putting the value of a

80= (40-9d)+7d

80= 40-2d

2d= 40-80

d= -40/2

= -20

therefore, a= 40-9d

= 40-9(-20)= 40+180= 220