Question

This table shows several values of an exponential function.
x f(x)
0 4
1 20
2 100
3 500
Write an equation for the function in the form f(x)=a(b)x.
Use whole numbers, decimals, or simplified fractions for the values of a and b.
f(x)=

Answer 1

f(x) = 4(5)^x

(Reason: ratio between successive values is 20/4 = 5, so b = 5; and f(0) = a = 4.)