Question

Write the explict formula for the geometric sequence. a^1=-5 a^2=20 a^3=-80
A. An=-5*(-4)^n
B. An=-5(-4)^n-1
C. An= -4(-5)^n-1
D. An=-5*(4)^n

Answer 1

An = ar^(n-1)

Answer 2

thats the formula to find nth term in geometric sequence