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

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GMAT Club Legend
Joined: 07 Jun 2014
Posts: 4749
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 93

Kudos [?]: 1650 [0], given: 396

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

Question Stats:

0% (00:00) correct 99% (00:10) wrong based on 7 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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GMAT Club Legend
Joined: 07 Jun 2014
Posts: 4749
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 93

Kudos [?]: 1650 [0], given: 396

Re: If f(x) = x2 + 1, what is the value of f(2) + f(–2)? (A) 0 ( [#permalink]  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!
_________________

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