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

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Math Expert
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V
Joined: 02 Sep 2009
Posts: 47898
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
2
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

86% (00:42) correct 14% (00:51) wrong based on 100 sessions

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Intern
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B
Joined: 05 Mar 2017
Posts: 12
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
f(y) = y^3 - 4 = 4

so, y^3 = 8

y = 2

D.
Intern
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S
Joined: 02 Sep 2015
Posts: 37
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.
Target Test Prep Representative
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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 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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Re: If f(x) = x 3 – 4 and f(y) = 4, then y is equal to &nbs [#permalink] 01 Nov 2017, 17:10
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