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) = 1/12 then b= ?
Choose the correct choice
A) -1/6  B) 1/6  C) 6  D) -6  E) 3
f(a) = -1/2 = -1/a, and thus a = 2   f(ab) = 1/12, and thus ab = -12   2b = -12   b = -6   The answer is -6.
<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) = 1/12 then b= ?