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GMAT Prep
If a function f is defined by \(f(x)=-\dfrac{1}{x}\) for all nonzero numbers x. If \(f(a)=-\dfrac{1}{2}\) and \(f(ab)=\dfrac{1}{6}\) then b=?
A. 3
B. 1/3
C. -1/3
D. -3
E. -12
OA D
If a function f is defined by \(f(x)=-\dfrac{1}{x}\) for all nonzero numbers x. If \(f(a)=-\dfrac{1}{2}\) and \(f(ab)=\dfrac{1}{6}\) then b=?
A. 3
B. 1/3
C. -1/3
D. -3
E. -12
OA D
