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# For all numbers, x, if f(x) is defined by f(x) = 3x^2, and f(x − 3) =

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Math Expert
Joined: 02 Sep 2009
Posts: 53005
For all numbers, x, if f(x) is defined by f(x) = 3x^2, and f(x − 3) =  [#permalink]

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21 Jan 2019, 02:30
00:00

Difficulty:

25% (medium)

Question Stats:

76% (01:41) correct 24% (01:14) wrong based on 30 sessions

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For all numbers, x, if f(x) is defined by f(x) = 3x^2, and f(x − 3) = 12, then x could equal which of the following?

A 2
B 4
C 5
D 7
E 8

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Joined: 31 Oct 2013
Posts: 1136
Concentration: Accounting, Finance
GPA: 3.68
WE: Analyst (Accounting)
For all numbers, x, if f(x) is defined by f(x) = 3x^2, and f(x − 3) =  [#permalink]

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21 Jan 2019, 03:19
Bunuel wrote:
For all numbers, x, if f(x) is defined by f(x) = 3x^2, and f(x − 3) = 12, then x could equal which of the following?

A 2
B 4
C 5
D 7
E 8

Function : f(x) = $$3x^2$$

Given ,

f(x − 3) = 12

$$3(x-3)^2 = 12$$

$$(x - 3)^2 = 4.$$

x-3 = 2 = x = 5.

or

x - 3 = -2 = x= 1.

For all numbers, x, if f(x) is defined by f(x) = 3x^2, and f(x − 3) =   [#permalink] 21 Jan 2019, 03:19
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