Can anyone provide some insight on this problem as well? thanks
For which of the following functions is
f(a+b)= f(a)+ f(b)for all positive numbers a and b?
a) f(x) = x^2
b) f(x) = x+1
c) f(x) = sqrt of x
d) f(x) = 2/x
e) f(x) = -3X
Answer:
e) -3x
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GMAT Prep Question (functions)
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f(a)=-3(a)gxj007 wrote:Can anyone provide some insight on this problem as well? thanks
For which of the following functions is
f(a+b)= f(a)+ f(b)for all positive numbers a and b?
a) f(x) = x^2
b) f(x) = x+1
c) f(x) = sqrt of x
d) f(x) = 2/x
e) f(x) = -3X
Answer:
e) -3x
f(b)=-3(b)
f(a+b)=-3(a+b) --jus replace x values
= (-3a )+ (-3b)
ans E
arbiter
