If a function f is defined by f(x)= -1/x for all non zero numbers x. If f(a) = -1/2 and f(ab) = 1/4 then b= ? Choose the correct choice from the following
A) -1/2
B) 1/2
C) 2
D) -2
E) 8
f(a) = -1/2 = -1/a, and thus a = 2   f(ab) = 1/4, and thus ab = -4   2b = -4   b = -2   The answer is -2.
<result>D</result>
If a function f is defined by f(x)= -1/x for all non zero numbers x. If f(a) = -1/2 and f(ab) = 1/4 then b= ?