GMAT Practice Question Set #19 (Question 55-57)

Problem Solving Question #56: Function Constraints  
Time 0 0 : 0 0 : 0 0

Among the functions given below, which one satisfies the equation f(x + y) = f(x) + f(y) for all
positive numbers x and y?

(A)

f(x) = -2x

(B)

f(x) = `2/x`

(C)

f(x) = `sqrt(x)`

(D)

f(x) = x + 1

(E)

f(x) = `x^2`

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