TTGWD3-27

Q27:

If f is the function defined for all k by f(k) = k⁵/16, what is f(2k) in terms of f(k)?

A.     1/8 f(k)

B.     5/8 f(k)

C.     2 f(k)

D.     10 f(k)

E.      32 f(k)

Answer: E

这么简单的题为什么怎么算都是C呢？

2^5 =32