Question

Write the explicit formula for the geometric sequence.

a1 = -5 a2 = 20 a3 = -80

Answer 1

Welcome To Open Study

Answer 2

ty

Answer 3

where r is the common ratio. use this formula on two of the above, and solve for U_1 and r

although we know U_1 = a_1

Answer 4

@bibby

Answer 5

@RainbowsxD

Answer 6

@bibby

Answer 7

Please confirm

Answer 8

need help ???

Answer 9

@leoncha

Answer 10

Do you think that's correct

Answer 11

what ???

Answer 12

where r is the common ratio. use this formula on two of the above, and solve for U_1 and r

although we know U_1 = a_1

Answer 13

which formula ???

Answer 14

explicit formula for geometric is

Answer 15

a1 mean first
mean n mean next term

Answer 16

first term is - 4
and 2nd term is 20
the said geometric so we have to multiply something by -4 to get 20

Answer 17

also 2nd term is positive so ratio should be negative bec first term also negative