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If f(x)=3xx and g(x)=x^2, what is f(g(4))?
[#permalink]
09 Dec 2015, 08:26
09 Dec 2015, 08:26
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Difficulty:
5%
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Question Stats:
94% (00:44) correct
6%
(01:21)
wrong
based on 405
sessions
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
A. -4
B. 8
C. 16
D. 32
E. 44
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Joined: 12 Sep 2015
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Re: If f(x)=3xx and g(x)=x^2, what is f(g(4))?
[#permalink]
09 Dec 2015, 09:32
09 Dec 2015, 09:32
4
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Expert Reply
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
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
General Discussion
Re: If f(x)=3xx and g(x)=x^2, what is f(g(4))?
[#permalink]
09 Dec 2015, 16:54
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
g(4) = 4^2 = 16
f(16) = 3*16 − √16 = 44
Answer:
E. 44
