Question

Ind the 7th term of the geometric sequence with the given terms.

a4 = -8 and a5 = -40; a7 = _______.

Answer 1

To find the seventh term of the geometric sequence, divide first the fifth term by the fourth term to obtain the common ratio. -40 divide by -8 is 5. Then, multiply a5 by the common ratio, 5 twice or a4 by 5 three times. Both solutions will give, an a7 equal to -1000. Thus, a7 is -1000.