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If f(x) = x 3 – 4 and f(y) = 4, then y is equal to

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V
Joined: 02 Sep 2009
Posts: 42327

Kudos [?]: 133105 [1], given: 12410

If f(x) = x 3 – 4 and f(y) = 4, then y is equal to [#permalink]

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New post 30 Oct 2017, 23:57
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A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

89% (00:47) correct 11% (00:49) wrong based on 56 sessions

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Kudos [?]: 133105 [1], given: 12410

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B
Joined: 05 Mar 2017
Posts: 14

Kudos [?]: 1 [0], given: 177

Re: If f(x) = x 3 – 4 and f(y) = 4, then y is equal to [#permalink]

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New post 31 Oct 2017, 08:09
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f(y) = y^3 - 4 = 4

so, y^3 = 8

y = 2

D.

Kudos [?]: 1 [0], given: 177

Intern
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S
Joined: 02 Sep 2015
Posts: 37

Kudos [?]: 27 [0], given: 21

Location: India
Concentration: General Management, Entrepreneurship
Schools: Sauder 'Dec 18
GPA: 3.79
WE: General Management (Energy and Utilities)
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Re: If f(x) = x 3 – 4 and f(y) = 4, then y is equal to [#permalink]

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New post 31 Oct 2017, 17:54
f(y) = y^3 - 4 = 4

so, y^3 = 8

y = 8^(1/3) = 2

Hence Answer is D.

Kudos [?]: 27 [0], given: 21

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Kudos [?]: 943 [0], given: 3

Location: United States (CA)
Re: If f(x) = x 3 – 4 and f(y) = 4, then y is equal to [#permalink]

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New post 01 Nov 2017, 17:10
Bunuel wrote:
If f(x) = x^3 – 4 and f(y) = 4, then y is equal to

(A) 0

(B) \(\sqrt[3]{2}\)

(C) \(\sqrt{2}\)

(D) 2

(E) 3


Since f(x) = x^3 - 4 and f(y) = 4, we see that f(y) = y^3 - 4, and so we have:

y^3 - 4 = 4

y^3 = 8

y = 2

Answer: D
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Kudos [?]: 943 [0], given: 3

Re: If f(x) = x 3 – 4 and f(y) = 4, then y is equal to   [#permalink] 01 Nov 2017, 17:10
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If f(x) = x 3 – 4 and f(y) = 4, then y is equal to

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