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# (SQRT (7) + SQRT(7))^2

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Math Expert
Joined: 02 Sep 2009
Posts: 62624

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16 Sep 2018, 01:21
1
4
00:00

Difficulty:

5% (low)

Question Stats:

90% (00:23) correct 10% (00:27) wrong based on 138 sessions

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$$(\sqrt{7} +\sqrt{7})^2$$

A. 98
B. 49
C. 28
D. 21
E. 14

_________________
Manager
Joined: 23 Apr 2018
Posts: 160
Re: (SQRT (7) + SQRT(7))^2  [#permalink]

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16 Sep 2018, 01:29
1
(A+B)^2 = A^2+B^2+2AB

7+7+2(7) = 28 option c

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VP
Joined: 31 Oct 2013
Posts: 1491
Concentration: Accounting, Finance
GPA: 3.68
WE: Analyst (Accounting)
Re: (SQRT (7) + SQRT(7))^2  [#permalink]

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16 Sep 2018, 01:53
Bunuel wrote:
$$(\sqrt{7} +\sqrt{7})^2$$

A. 98
B. 49
C. 28
D. 21
E. 14

$$(\sqrt{7} +\sqrt{7})^2$$

= $$(\sqrt{7})^2 + 2\sqrt{7}\sqrt{7} + (\sqrt{7})^2$$

= $$7 + 2\sqrt{49} + 7$$
= 7 + 2*7 + 7

= 28

Intern
Joined: 09 Apr 2016
Posts: 4
Re: (SQRT (7) + SQRT(7))^2  [#permalink]

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16 Sep 2018, 05:09
[√7+√7]^2= [2×√7]^2= 4×7= 28

Option C

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CEO
Joined: 03 Jun 2019
Posts: 2503
Location: India
GMAT 1: 690 Q50 V34
WE: Engineering (Transportation)
Re: (SQRT (7) + SQRT(7))^2  [#permalink]

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15 Sep 2019, 03:56
Bunuel wrote:
$$(\sqrt{7} +\sqrt{7})^2$$

A. 98
B. 49
C. 28
D. 21
E. 14

$$(\sqrt{7} +\sqrt{7})^2$$
=4*7 = 28

IMO C

Posted from my mobile device
Re: (SQRT (7) + SQRT(7))^2   [#permalink] 15 Sep 2019, 03:56
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