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For all numbers, x, if f(x) is defined by f(x) = 3x2, and f(x − 3) = 12, then x could equal which of the following?

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






 
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