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# If x + y = n, then x^2

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If x + y = n, then x^2 [#permalink]  13 May 2018, 08:55
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Question Stats:

100% (00:19) correct 0% (00:00) wrong based on 3 sessions
If $$x + y = n$$, then $$x^2 + 2xy + y^2 =$$

A. $$2n$$

B. $$n^2$$

C. $$n(x-y)$$

D. $$n^2 + 2y(n-y)$$

E. $$n^2 + xn - x^2$$
[Reveal] Spoiler: OA

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Director
Joined: 20 Apr 2016
Posts: 817
WE: Engineering (Energy and Utilities)
Followers: 9

Kudos [?]: 588 [1] , given: 114

Re: If x + y = n, then x^2 [#permalink]  04 Jul 2018, 12:40
1
KUDOS
Carcass wrote:
If $$x + y = n$$, then $$x^2 + 2xy + y^2 =$$

A. $$2n$$

B. $$n^2$$

C. $$n(x-y)$$

D. $$n^2 + 2y(n-y)$$

E. $$n^2 + xn - x^2$$

Here,
$$x^2 + 2xy + y^2 = (x + y)^2 = n^2$$
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Re: If x + y = n, then x^2   [#permalink] 04 Jul 2018, 12:40
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# If x + y = n, then x^2

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