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If f(x) = x2 + 1, what is the value of f(2) + f(–2)? (A) 0 (

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Retired Moderator
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Joined: 07 Jun 2014
Posts: 4803
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 173

Kudos [?]: 2971 [0], given: 394

If f(x) = x2 + 1, what is the value of f(2) + f(–2)? (A) 0 ( [#permalink] New post 25 Jul 2018, 17:09
Expert's post
00:00

Question Stats:

75% (00:15) correct 25% (00:10) wrong based on 32 sessions
If \(f(x) = x^2 + 1\), what is the value of \(f(2) + f(-2)\)?

(A) 0
(B) 1
(C) 4
(D) 5
(E) 10
[Reveal] Spoiler: OA

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Sandy
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Retired Moderator
User avatar
Joined: 07 Jun 2014
Posts: 4803
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 173

Kudos [?]: 2971 [0], given: 394

Re: If f(x) = x2 + 1, what is the value of f(2) + f(–2)? (A) 0 ( [#permalink] New post 31 Jul 2018, 14:13
Expert's post
Explanation

Use the notation “f(x)” and “f(2)” as an indication to substitute 2 for x in the given equation:

\(f(2) = (2)^2 + 1\)
\(f(2) = 5\)

Likewise, plug –2 in for x:

\(f(–2) = (-2)^2 + 1\)
\(f(-2) = 5\)

Now add: 5 + 5 = 10.

Hence option E is correct!
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Sandy
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Joined: 08 Dec 2018
Posts: 8
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Kudos [?]: 6 [0], given: 2

Re: If f(x) = x2 + 1, what is the value of f(2) + f(–2)? (A) 0 ( [#permalink] New post 18 Mar 2019, 20:17
why the OA is B?
1 KUDOS received
GRE Instructor
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Joined: 10 Apr 2015
Posts: 3871
Followers: 158

Kudos [?]: 4640 [1] , given: 70

Re: If f(x) = x2 + 1, what is the value of f(2) + f(–2)? (A) 0 ( [#permalink] New post 19 Mar 2019, 04:12
1
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Expert's post
minniethakur wrote:
why the OA is B?


That was a mistake.
I've edited the question to show the correct answer as E

Cheers,
Brent
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Brent Hanneson – Creator of greenlighttestprep.com
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Re: If f(x) = x2 + 1, what is the value of f(2) + f(–2)? (A) 0 (   [#permalink] 19 Mar 2019, 04:12
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