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# The function f is defined by f(x) = - 1/x for all nonzero

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Manager
Joined: 10 Oct 2008
Posts: 56
The function f is defined by f(x) = - 1/x for all nonzero [#permalink]

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17 Oct 2008, 09:39
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

The function f is defined by f(x) = - 1/x for all nonzero numbers x. If f(a) = - 1/2 and f(ab) = 1/6, then b =

A. 3
B. 1/3
C. - 1/3
D. -3
E. –12
Manager
Joined: 14 Jan 2006
Posts: 95
Schools: HKUST

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17 Oct 2008, 10:51
f(a) = -1/a = -1/2 i.e, a = 2
f(ab) = -1/ab = 1/6 i.e, ab = -6
Therefore,
b = -3
Hence, D
Re: function   [#permalink] 17 Oct 2008, 10:51
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# The function f is defined by f(x) = - 1/x for all nonzero

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