Answer:
b = -5 and c = -4
Step-by-step explanation:
The common ratio here is r = 20/(-5), or -4, and the first term, a(1), is -5. Thus, the explicit formula is
a(n) = a(1)*r^(n -1) (must use parentheses, as shown)
and so we have a(n) = -5*(-4)^(n - 1). b = -5 and c = -4
