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# Given that a and b are real numbers, let f (a, b) = ab and let g(a) =

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Math Expert
Joined: 02 Sep 2009
Posts: 43898
Given that a and b are real numbers, let f (a, b) = ab and let g(a) = [#permalink]

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29 Oct 2017, 00:18
00:00

Difficulty:

5% (low)

Question Stats:

97% (00:40) correct 3% (00:35) wrong based on 65 sessions

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Given that a and b are real numbers, let f(a, b) = ab and let g(a) = a^2 + 2. Then f[3, g(3)] =

(A) 3a^2 + 2
(B) 3a^2 + 6
(C) 27
(D) 29
(E) 33
[Reveal] Spoiler: OA

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Joined: 25 Feb 2013
Posts: 947
Location: India
GPA: 3.82
Re: Given that a and b are real numbers, let f (a, b) = ab and let g(a) = [#permalink]

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29 Oct 2017, 10:42
Bunuel wrote:
Given that a and b are real numbers, let f(a, b) = ab and let g(a) = a^2 + 2. Then f[3, g(3)] =

(A) 3a^2 + 2
(B) 3a^2 + 6
(C) 27
(D) 29
(E) 33

$$g(3)=3^2+2=11$$

so $$f(3,11)=3*11=33$$

Option E
Re: Given that a and b are real numbers, let f (a, b) = ab and let g(a) =   [#permalink] 29 Oct 2017, 10:42
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