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The function f(x) is equal to the square of a number lessened by 5. Th

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SVP
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The function f(x) is equal to the square of a number lessened by 5. Th  [#permalink]

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27 Mar 2019, 02:02
00:00

Difficulty:

5% (low)

Question Stats:

96% (00:47) correct 4% (01:29) wrong based on 28 sessions

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The function f(x) is equal to the square of a number lessened by 5. The function g(x) is equal to a number tripled. What is f(g(2)) ?

a. 4

b. 7

c. 13

d. 22

e. 31

Source : Barron's GMAT

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Re: The function f(x) is equal to the square of a number lessened by 5. Th  [#permalink]

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27 Mar 2019, 10:10
Let the number be x.
Now, f(x) = x^2-5
g(x) = 3x.

f(g(2)) = g(2)^2-5
g(2) = 3*2 = 6.
f(g(2)) = 36-5 = 31

E is the answer
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Re: The function f(x) is equal to the square of a number lessened by 5. Th  [#permalink]

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22 Apr 2019, 18:49
Did not understand the flow of this solution. Why did you multiply with 3 before squaring 2?
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Re: The function f(x) is equal to the square of a number lessened by 5. Th  [#permalink]

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23 Apr 2019, 00:20
1

Solution

Given:
• The function $$f(x) = x^2 – 5$$
• The function $$g(x) = x * 3$$

To find:
• The value of $$f(g(2))$$

Approach and Working:
As $$g(x) = x * 3$$,
• The value of $$g(2) = 2 * 3 = 6$$

Therefore, $$f(g(2)) = f(6) = 6^2 – 5 = 36 – 5 = 31$$

Hence, the correct answer is option E.

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Re: The function f(x) is equal to the square of a number lessened by 5. Th   [#permalink] 23 Apr 2019, 00:20
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