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I never learned functions and how to approach them, when i

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Senior Manager
Senior Manager
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Joined: 04 Aug 2008
Posts: 372

Kudos [?]: 39 [0], given: 1

I never learned functions and how to approach them, when i [#permalink]

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New post 28 Sep 2008, 15:39
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

I never learned functions and how to approach them, when i see f(x) my brain gets paralized and freezes up. Here is the question (i guessed right tho :)

For which of the following functions is f(a+b) = f(a) + f(b) for all positive numbers a and b?

f(x) = x^2
f(x) =x+1
f(x) =sqrt of x
f(x) = 2/x
f(x) = -3x
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Kudos [?]: 39 [0], given: 1

Manager
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Kudos [?]: 48 [0], given: 0

Re: Functions nightmare [#permalink]

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New post 28 Sep 2008, 16:37
Hi

I got E as answer

f(x) = -3x .

f(a+b) = -3 (a+b) = -3a -3b --------------1

f(a) + f(b) = -3a + (-b) = -3a -3b ---------2

1 = 2

does GMAT ask this type of questions?

Kudos [?]: 48 [0], given: 0

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Kudos [?]: 454 [0], given: 1

Re: Functions nightmare [#permalink]

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New post 28 Sep 2008, 21:09
vr4indian wrote:
Hi

I got E as answer

f(x) = -3x .

f(a+b) = -3 (a+b) = -3a -3b --------------1

f(a) + f(b) = -3a + (-b) = -3a -3b ---------2

1 = 2

does GMAT ask this type of questions?


I believe these questions appear on the test. there was a similar q yesterday that was posted here. the key here is to figure out that we have to substitute (a+b), a and b respectively for the functions.

Kudos [?]: 454 [0], given: 1

Re: Functions nightmare   [#permalink] 28 Sep 2008, 21:09
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I never learned functions and how to approach them, when i

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