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# Which is equal to (3 - 2^(1/2))(3 + 2^(1/2))

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Math Expert
Joined: 02 Sep 2009
Posts: 61385
Which is equal to (3 - 2^(1/2))(3 + 2^(1/2))  [#permalink]

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20 Apr 2017, 23:03
00:00

Difficulty:

15% (low)

Question Stats:

87% (00:21) correct 13% (00:25) wrong based on 30 sessions

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Which is equal to $$(3 − \sqrt{2})(3 + \sqrt{2})$$?

A. $$11 − 6\sqrt{2}$$

B. $$7 − 6\sqrt{2}$$

C. 5

D. 7

E. 11

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Joined: 02 Sep 2016
Posts: 633
Re: Which is equal to (3 - 2^(1/2))(3 + 2^(1/2))  [#permalink]

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21 Apr 2017, 00:01
1
(3−√2)(3+√2) looks similar to the identity (a-b)(a+b)= a^2-b^2

=9-2=7
Re: Which is equal to (3 - 2^(1/2))(3 + 2^(1/2))   [#permalink] 21 Apr 2017, 00:01
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