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

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Senior Manager
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For which of the following functions is f(a+b)=f(a)+f(b) for [#permalink]  03 Apr 2006, 03:07
For which of the following functions is f(a+b)=f(a)+f(b) for all the positive numbers a and b?

f(x)=x^2
f(x)=x+1
f(x)=sqrt x
f(x)=2/x
f(x)=-3x
Senior Manager
Joined: 22 Jun 2005
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Kudos [?]: 5 [0], given: 0

f(a+b)=-3(a+b)=f(a) + f(b)
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