Question

find the eighth term of the geometric sequence, given the first term and the common ratio. a1= 2 and r= -2

Answer 1

`a_n=ar^(n-1)}\\\\a_1=2\\r=-2\\\\a_8=2\cdot(-2)^(8-1)=2\cdot(-2)^7=2\cdot(-128)=-256`