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For all numbers, x, the function f is defined by , where a is a constant. If f(3) = 45, then a =

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For all numbers, <em>x</em>, the function <em>f</em> is defined by <img alt='Image' src='https://www.fatskills.com/images3/gre/inequ11_107.jpg'/><br>, where <em>a</em> is a constant. If <em>f</em>(3) = 45, then <em>a</em> =






 
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