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GMAT Function

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Source: — Problem Solving |
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Re: GMAT Function

by logitech » Thu Nov 20, 2008 1:46 am
moneyman wrote:Pls explain
Since f(a)+f(b)=f(a+b)

you can pick any two numbers and solve the question. e.g a=1, b=2

or you can think the problem as:

f(x) + f(x) = f(x+x)

2(fx)=f(2x)

Only option E satisfies this:

2(-3x) = -3(2x)

Hence, E
LGTCH
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