Question

if an =4-3n, find the sum of 8 terms​

Answer 1

Step-by-step explanation:

a1=4-3 =1

a2 = 4-6 =-2

a3=4-9 =-5

a=1 , d=-3

sum = 8/2(2×1+(7×-3))

=4×-19

=-76