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If f(x) = x + 5 and f(2g) = 19, what is the value of f(3 – g

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GMAT Club Legend
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If f(x) = x + 5 and f(2g) = 19, what is the value of f(3 – g [#permalink] New post 24 Jul 2018, 05:57
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If \(f(x) = x + 5\) and \(f(2g) = 19\), what is the value of \(f(3 – g)\)?

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Re: If f(x) = x + 5 and f(2g) = 19, what is the value of f(3 – g [#permalink] New post 27 Jul 2018, 17:09
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2g+5=19

it implies: g=7.

Therefore, f(3-g)= 3-g+5

=3-7+5

=1.

I hope this is correct.
GMAT Club Legend
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Joined: 07 Jun 2014
Posts: 4721
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 91

Kudos [?]: 1625 [0], given: 389

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Re: If f(x) = x + 5 and f(2g) = 19, what is the value of f(3 – g [#permalink] New post 31 Jul 2018, 14:19
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Explanation

The main function is \(f(x) = x + 5\). The notation \(f(2g)\) indicates that you should plug \(2g\) in for all instances of x: \(f(2g) = 2g + 5\), which is also given as 19. If \(2g + 5 = 19\), then \(2g = 14\), and \(g = 7\).

The question asks for the value of \(f(3 - g)\), which is \(f(3 - 7) = f(-4) = -4 + 5 = 1\).
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Re: If f(x) = x + 5 and f(2g) = 19, what is the value of f(3 – g   [#permalink] 31 Jul 2018, 14:19
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If f(x) = x + 5 and f(2g) = 19, what is the value of f(3 – g

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