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

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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
Spoiler: OA

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

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New post 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.

C is the correct answer.

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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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