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Math Expert V
Joined: 02 Sep 2009
Posts: 58954
If x^2 + 2xy + y^2 = 25, then (x + y)^3 could be  [#permalink]

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Difficulty:   15% (low)

Question Stats: 86% (00:59) correct 14% (00:56) wrong based on 36 sessions

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If x^2 + 2xy + y^2 = 25, then (x + y)^3 could be

A. 5
B. 15
C. 50
D. 75
E. 125

_________________
GMAT Club Legend  D
Joined: 18 Aug 2017
Posts: 5245
Location: India
Concentration: Sustainability, Marketing
GPA: 4
WE: Marketing (Energy and Utilities)
Re: If x^2 + 2xy + y^2 = 25, then (x + y)^3 could be  [#permalink]

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Bunuel wrote:
If x^2 + 2xy + y^2 = 25, then (x + y)^3 could be

A. 5
B. 15
C. 50
D. 75
E. 125

x^2 + 2xy + y^2 = 25
(x+y)^2 = 25
or say
x+y=5
so
(x+y)^3 = 125
IMO E
VP  D
Joined: 31 Oct 2013
Posts: 1471
Concentration: Accounting, Finance
GPA: 3.68
WE: Analyst (Accounting)
Re: If x^2 + 2xy + y^2 = 25, then (x + y)^3 could be  [#permalink]

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Bunuel wrote:
If x^2 + 2xy + y^2 = 25, then (x + y)^3 could be

A. 5
B. 15
C. 50
D. 75
E. 125

$$x^2 + 2xy + y^2 = 25$$

$$(x + y)^2 = (5)^2$$

x + y = 5.

we are asked to determine the value of $$(x + y)^3$$.

$$(x + y)^3$$

$$(5)^3$$

125. Re: If x^2 + 2xy + y^2 = 25, then (x + y)^3 could be   [#permalink] 28 Feb 2019, 12:20
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# If x^2 + 2xy + y^2 = 25, then (x + y)^3 could be  