Question

Find the 7th term of the geometric sequence with the given terms.
a4 = -8 and a5 = -40; a7 = _______.

help??? D:

Answer 1

7th term = ar^(7-1)
where a = first term and r = common ratio

Answer 2

r = a5 / a4

Answer 3

after you find a7 = a5 * r^2

Answer 4

* after you find r a7 = a5* r^2

Answer 5

U know. a4=a1r3 and a5=a1r4
Divide both the equations..... a5/a4 = a1r4/a1r3
-40/-8=r
r=5
Put r in any of the equations to get a1...
now U can find...a7=a1r6