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What is the minimal value of function f(x)?

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What is the minimal value of function f(x)? [#permalink]

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New post 25 Nov 2011, 15:24
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What is the minimal value of function f(x)?

(1) f(0) = 16
(2) f(x) = (x – 4)^2
[Reveal] Spoiler: OA

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Last edited by Bunuel on 13 Jul 2014, 12:49, edited 1 time in total.
Renamed the topic and edited the question.

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Re: What is the minimal value of function f(x)? [#permalink]

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New post 25 Nov 2011, 15:39
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(1) doesn't say anything about f(x) except it's initial value, subsequent values can be higher or lower.
(2) defines the function, therefore, it's possible to find minimum. in this case the minimum value would be (negative infinity), i don't believe GMAT deals with infinities.

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New post 26 Nov 2011, 07:33
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manalq8 wrote:
What is the minimal value of function f(x)?

(1) f(0) = 16
(2) f(x) = (x – 4)2


What a strange question. Statement 1 is clearly not sufficient, since you only know about one value of the function. Statement 2 is certainly sufficient, since you know the exact definition of the function, so you can answer any question about it. There's no need to do any work.

And while you don't need to do any calculation here, the minimum value would be 0 if, as I assume, you mean Statement 2 to read:

f(x) = (x-4)^2

Then when x=4, f(x) = 0. The value of f(x) cannot be negative since it is a square.
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Re: What is the minimal value of function f(x)? [#permalink]

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New post 26 Nov 2011, 11:28
thanks alot for the explanation
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Re: What is the minimal value of function f(x)? [#permalink]

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New post 30 Nov 2011, 23:27
thanks for the explanation- i got it worng :(

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Re: What is the minimal value of function f(x)? [#permalink]

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New post 09 Sep 2017, 06:42
manalq8 wrote:
What is the minimal value of function f(x)?

(1) f(0) = 16
(2) f(x) = (x – 4)^2


St 1

What's the function?

insuff

St 2

To minimize just plug in 4

suff

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Re: What is the minimal value of function f(x)?   [#permalink] 09 Sep 2017, 06:42
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