Answer:
b = 12
Step-by-step explanation:
a^2 + b^2 = c^2
25 + b^2 = 169
b^2 = 144
This is a geometric sequence with n th term formula
=
where r is the common ratio and the first term
here = - and
r = = = 6
= -
or in terms of x
f(x) = -