Question

The 10th term of an ap is-37 and the sum of its first 6th term is-27 .find the sun of its first 8 th term

Answer 1

Answer:

-32

Step-by-step explanation:

a10=a+9d-(1)

a6=a+5d-(2)

(1)-(2)

1. a+9d=-37
2. a+5d=-27(change sign)

4d=-10

d=-10/4=-5/2

sub in-(2)

a+d( 5 )=-27

2a-25/2 =-27

2a-25=-54

2a=-54+25

2a=-29

a=-14.5

a8=-14.5-35÷2

a8=-14.5-17.5

a8=-32