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function

by sq720 » Sat Jul 04, 2009 4:05 pm
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=

3
1/3
-1/3
-3
-12
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by DeepakR » Sat Jul 04, 2009 5:29 pm
f(a)=-1/a=-1/2 hence we get a=2.
Similarly, f(ab)=-1/ab=1/6 so ab=-6. Substitute a=2 we get, b=-3
OA = D

-Deepak
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