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problem with functions

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Junior | Next Rank: 30 Posts
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problem with functions

by Khaim » Thu Jul 16, 2009 4:09 pm
For which of the following functions is f(a+b) = f(a) + f(b) for all positive number a and b ?

A f(x) = x2
B f(x) = x + 1
C f(x) = square root of x
D f(x) = 2/x
E f(x) = -3x


I have no idea :?
..Qui ne tente rien n'a rien
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by tohellandback » Thu Jul 16, 2009 4:18 pm
E
f(a+b) = f(a) + f(b)
jus put a=1 and b=2
so f(3)=f(1)+f(2)
The powers of two are bloody impolite!!
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Junior | Next Rank: 30 Posts
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by Khaim » Thu Jul 16, 2009 6:34 pm
but whit it is minus 3 ?
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