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If f(x)=3x−√x and g(x)=x^2, what is f(g(4))?

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V
Joined: 02 Sep 2009
Posts: 46217
If f(x)=3x−√x and g(x)=x^2, what is f(g(4))? [#permalink]

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New post 09 Dec 2015, 08:26
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

94% (00:36) correct 6% (00:50) wrong based on 281 sessions

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CEO
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P
Joined: 12 Sep 2015
Posts: 2564
Location: Canada
Re: If f(x)=3x−√x and g(x)=x^2, what is f(g(4))? [#permalink]

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New post 09 Dec 2015, 09:32
2
Bunuel wrote:
If f(x) = 3x − √x and g(x) = x^2, what is f(g(4))?

A. -4
B. 8
C. 16
D. 32
E. 44


g(x) = x²
g(4) = 4² = 16

So, f(g(4)) = f(16)

f(x) = 3x − √x
So, f(16) = 3(16) − √16
= 48 - 4
= 44
= E

Cheers,
Brent
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Brent Hanneson – Founder of gmatprepnow.com

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Senior Manager
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Joined: 28 Feb 2014
Posts: 295
Location: United States
Concentration: Strategy, General Management
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Re: If f(x)=3x−√x and g(x)=x^2, what is f(g(4))? [#permalink]

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New post 09 Dec 2015, 16:54
If f(x) = 3x − √x and g(x) = x^2, what is f(g(4))?

g(4) = 4^2 = 16

f(16) = 3*16 − √16 = 44

Answer:
E. 44
Manager
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Joined: 06 Jul 2014
Posts: 102
Location: India
Concentration: Finance, Entrepreneurship
GMAT 1: 640 Q48 V30
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Re: If f(x)=3x−√x and g(x)=x^2, what is f(g(4))? [#permalink]

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New post 14 Aug 2017, 14:56
If f(x) = 3x − √x and g(x) = x^2, what is f(g(4))?

g(4)= 16; f(16)= 48-4=44
Senior Manager
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Joined: 04 Sep 2015
Posts: 460
Location: India
WE: Information Technology (Computer Software)
Re: If f(x)=3x−√x and g(x)=x^2, what is f(g(4))? [#permalink]

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New post 22 Aug 2017, 11:24
f f(x) = 3x − √x and g(x) = x^2, what is f(g(4))?

A. -4
B. 8
C. 16
D. 32
E. 44

g(4)=16
f(16)=48-4=44

Option E=44
Re: If f(x)=3x−√x and g(x)=x^2, what is f(g(4))?   [#permalink] 22 Aug 2017, 11:24
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