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GRE Prep Club Legend  Joined: 07 Jun 2014
Posts: 4857
GRE 1: Q167 V156 WE: Business Development (Energy and Utilities)
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If f(x) = x2 – 1, what is the value of f(y) + f(–1)? [#permalink]
Expert's post 00:00

Question Stats: 100% (00:37) correct 0% (00:00) wrong based on 8 sessions
If $$f(x) = x^2 - 1$$, what is the value of $$f(y) + f(-1)$$?

(A) $$y^2 - 1$$
(B) $$y^2$$
(C) $$y^2 + 1$$
(D) $$y^2 - 2y$$
(E) $$y^2 - 2y - 1$$
[Reveal] Spoiler: OA

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Sandy
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GRE Prep Club Legend  Joined: 07 Jun 2014
Posts: 4857
GRE 1: Q167 V156 WE: Business Development (Energy and Utilities)
Followers: 105

Kudos [?]: 1783 , given: 397

Re: If f(x) = x2 – 1, what is the value of f(y) + f(–1)? [#permalink]
Expert's post
Explanation

The question requires plugging y into the function, then plugging –1 into the function, then summing the two results:

$$f(y) = y^2 - 1$$
$$f(-1) = (-1)^2 - 1$$
$$f(-1) = 0$$

Thus, $$f(y) + f(-1) = y^2 - 1 + 0 = y^2 - 1$$.
_________________

Sandy
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Try our free Online GRE Test Re: If f(x) = x2 – 1, what is the value of f(y) + f(–1)?   [#permalink] 31 Jul 2018, 14:22
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