An exponential function \(f\) is defined by \(f(x)=k(4)^{x}\), where …

Question

Prompt

An exponential function

f

is defined by

f (x) = k (4)^{x}

, where

k

is a positive constant. If

f (- 1) = 7

and

f (2) = 448

, what is the value of

k