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(3^(1/2) + 2)(3^(1/2) - 2)

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(3^(1/2) + 2)(3^(1/2) - 2)  [#permalink]

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New post 08 Oct 2018, 02:39
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

94% (00:18) correct 6% (00:21) wrong based on 89 sessions

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Re: (3^(1/2) + 2)(3^(1/2) - 2)  [#permalink]

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New post 08 Oct 2018, 02:56
1
Bunuel wrote:
\((\sqrt{3} + 2)(\sqrt{3} - 2)=\)


A. \(\sqrt{3}-4\)

B. \(\sqrt{6}-4\)

C. -1

D. 1

E. 2


Square of a difference = a^2 - b^2 = (a-b)(a+b)

3 - 4 = -1

Answer choice C

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Re: (3^(1/2) + 2)(3^(1/2) - 2)  [#permalink]

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New post 08 Oct 2018, 08:58
Bunuel wrote:
\((\sqrt{3} + 2)(\sqrt{3} - 2)=\)


A. \(\sqrt{3}-4\)

B. \(\sqrt{6}-4\)

C. -1

D. 1

E. 2


\((\sqrt{3} + 2)(\sqrt{3} - 2)\)

\(= \sqrt{3}*\sqrt{3} - 2*2\)

\(= 3 - 4\)

\(= -1\),Answer must be (C)
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Re: (3^(1/2) + 2)(3^(1/2) - 2)  [#permalink]

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New post 15 Sep 2019, 05:00
Bunuel wrote:
\((\sqrt{3} + 2)(\sqrt{3} - 2)=\)


A. \(\sqrt{3}-4\)

B. \(\sqrt{6}-4\)

C. -1

D. 1

E. 2


\((\sqrt{3} + 2)(\sqrt{3} - 2)=\)
= 3-4 =-1

IMO C

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Re: (3^(1/2) + 2)(3^(1/2) - 2)   [#permalink] 15 Sep 2019, 05:00
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