f(x)=b*x^a

[Guru]

A function called f is of the following type: f(x)=b*x^a
I know the following:
f(2)=4
f(4)=64
I have to find out what a and b is.
Can you help me.

[Daniel Faraday]

b = 1/4
a = 4

That sounds right to me.