08APP
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Source: Beat The GMAT — Problem Solving |
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sujaysolanki
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hemanth28
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pretty simple...
f(a)+f(b)=f(a+b)
check with each options if this is satisfied.
if f(x)=x^2.
than f(a)+f(b) =a^2+b^2 which is not equal to (a+b)^2.
similarly for others too it doesnt go...except if f(x)=-3x
f(a)+f(b) = -3a-3b=-3(a+b) =f(a+b).
f(a)+f(b)=f(a+b)
check with each options if this is satisfied.
if f(x)=x^2.
than f(a)+f(b) =a^2+b^2 which is not equal to (a+b)^2.
similarly for others too it doesnt go...except if f(x)=-3x
f(a)+f(b) = -3a-3b=-3(a+b) =f(a+b).
