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# If f(2x+3)=-6x, f(5)=?

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Math Revolution GMAT Instructor
Joined: 16 Aug 2015
Posts: 7363
GMAT 1: 760 Q51 V42
GPA: 3.82

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29 Jun 2017, 03:01
1
00:00

Difficulty:

15% (low)

Question Stats:

80% (01:03) correct 20% (02:34) wrong based on 53 sessions

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If f(2x+3)=-6x, f(5)=?

A. -6
B. -3
C. -2
D. 3
E. 6

_________________
MathRevolution: Finish GMAT Quant Section with 10 minutes to spare
The one-and-only World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy.
"Only $149 for 3 month Online Course" "Free Resources-30 day online access & Diagnostic Test" "Unlimited Access to over 120 free video lessons - try it yourself" Intern Joined: 04 Mar 2017 Posts: 6 Re: If f(2x+3)=-6x, f(5)=? [#permalink] ### Show Tags 29 Jun 2017, 03:09 Ans : A After putting the value of x=1 in the f(2x+3) Sent from my iPhone using GMAT Club Forum Director Joined: 04 Dec 2015 Posts: 750 Location: India Concentration: Technology, Strategy WE: Information Technology (Consulting) If f(2x+3)=-6x, f(5)=? [#permalink] ### Show Tags 29 Jun 2017, 03:33 MathRevolution wrote: If f(2x+3)=-6x, f(5)=? A. -6 B. -3 C. -2 D. 3 E. 6 If $$f(2x+3)=-6x, f(5)=?$$ $$f(2x+3)= -(2x*3) = -6x$$ $$f(5)$$ can be written as $$f(2+3)$$. $$f(5)$$ $$= f(2+3) = -(2*3) = -6$$ Answer (A)... Math Revolution GMAT Instructor Joined: 16 Aug 2015 Posts: 7363 GMAT 1: 760 Q51 V42 GPA: 3.82 Re: If f(2x+3)=-6x, f(5)=? [#permalink] ### Show Tags 02 Jul 2017, 18:12 ==> From2x+3=5, you get x=1, and then you get f(5)=-6(1)=-6. The answer is A. Answer: A _________________ MathRevolution: Finish GMAT Quant Section with 10 minutes to spare The one-and-only World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only$149 for 3 month Online Course"
"Free Resources-30 day online access & Diagnostic Test"
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Re: If f(2x+3)=-6x, f(5)=?   [#permalink] 02 Jul 2017, 18:12
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