Question #62d78

1 Answer
Feb 7, 2017

The equation of arithmetic sequence is below:

A_n = (n-1)*d + A_1An=(n1)d+A1

by using a_9a9 = -121:
a_9=-121 = (9-1)d -33a9=121=(91)d33
d = -22d=22

So we can write the equation of this sequence because we now have d

A_n = -11(n-1) -33An=11(n1)33

Now solve for a_32a32

a_32 = -11(32-1)-33a32=11(321)33
a_32 = -374a32=374