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# For which of the following functions is f(a + b) = f(a) +

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Intern
Joined: 23 Oct 2008
Posts: 23
For which of the following functions is f(a + b) = f(a) + [#permalink]

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30 Nov 2008, 23:58
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

For which of the following functions is f(a + b) = f(a) + f(b) for all positive numbers a and b?
(a) f(x) = x^2
(b) f(x) = x + 1
(c) f(x) = x^(1/2)
(d) f(x) = 2/x
(e) f(x) = -3x

Senior Manager
Joined: 28 Feb 2007
Posts: 299
Re: Math Q from GMATPrep [#permalink]

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01 Dec 2008, 00:12
E.
F(x)=-3x
then
F(a+b)=-3(a+b)=-3a -3b
F(a)= -3a
F(b)= -3b so F(a+b)= f(a)+f(b)
Re: Math Q from GMATPrep   [#permalink] 01 Dec 2008, 00:12
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# For which of the following functions is f(a + b) = f(a) +

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