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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
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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30 Oct 2017, 23:57
2
00:00

Difficulty:

15% (low)

Question Stats:

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

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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

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

so, y^3 = 8

y = 2

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

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

so, y^3 = 8

y = 8^(1/3) = 2

Target Test Prep Representative
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Joined: 14 Oct 2015
Posts: 3161
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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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

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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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