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

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Math Revolution GMAT Instructor
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If f(2x+3)=-6x, f(5)=?  [#permalink]

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New post 29 Jun 2017, 03:01
1
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A
B
C
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E

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Question Stats:

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

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

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Re: If f(2x+3)=-6x, f(5)=?  [#permalink]

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New post 29 Jun 2017, 03:09
Ans : A
After putting the value of x=1 in the f(2x+3)


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If f(2x+3)=-6x, f(5)=?  [#permalink]

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New post 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
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Re: If f(2x+3)=-6x, f(5)=?  [#permalink]

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New post 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
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Re: If f(2x+3)=-6x, f(5)=?   [#permalink] 02 Jul 2017, 18:12
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