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{1/(4-√t15)}^2=

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Senior Manager
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Status: No dream is too large, no dreamer is too small
Joined: 14 Jul 2010
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{1/(4-√t15)}^2=  [#permalink]

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New post 18 Jan 2012, 08:27
12
00:00
A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

65% (01:31) correct 35% (01:51) wrong based on 306 sessions

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{1/(4-√15)}^2 =

a. 16+16√15
b. 31- 8√15
c. 31+ 8√15
d. 32- 4√15
e. 32 + 4√15

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Posts: 61396
Re: {1/(4-√t15)}^2=  [#permalink]

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New post 18 Jan 2012, 09:40
1
1
SVP
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Status: The Best Or Nothing
Joined: 27 Dec 2012
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Concentration: General Management, Technology
WE: Information Technology (Computer Software)
Re: {1/(4-√t15)}^2=  [#permalink]

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New post 27 Feb 2014, 21:03
Did in this way:

1 / (16 - 8 root15 + 15)

= 1 / (31 - 8 root15)

Multiply numerator & denominator by (31 + 8 root15)

= (31 + 8 root15) / (961-960) = (31 + 8 root15)

Answer = C
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New post 29 Dec 2019, 18:10
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Re: {1/(4-√t15)}^2=   [#permalink] 29 Dec 2019, 18:10
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