document.write( "Question 1074223: Hello! Thank you for your time.
\n" ); document.write( "I am trying to solve a function problem and so far I haven't been able to find similar practice questions where two different functions are given.\r
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\n" ); document.write( "If f(x)= 12 - (x^2 / 2) and f(2k) = 2k, what is one possible value of k? \r
\n" ); document.write( "\n" ); document.write( "The multiple choice options are : 2 , 3, 4, 6, 8
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\n" ); document.write( "\n" ); document.write( "What I'm stuck on: if f(2k) = 2k, wouldn't that mean 2k = 2k, thus k = k? So any value can be inputted? I'm not sure what I should do with x either...\r
\n" ); document.write( "\n" ); document.write( "Any insight into how to go about solving a problem like this is very much appreciated! It's been a few years since I've worked with functions. Thanks once again! \n" ); document.write( "

Algebra.Com's Answer #688932 by Edwin McCravy(20059) $\"\"$ $\"About$

You can put this solution on YOUR website!
If $\"%22f%28x%29%22=+12+-+%28x%5E2+%2F+2%29\"$ and $\"f%282k%29+=+2k\"$ ,
\n" ); document.write( "what is one possible value of k?
\n" ); document.write( "The multiple choice options are : 2 , 3, 4, 6, 8
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document.write( "You haven't yet gotten the concept of what f(x) and f( )\r\n" );
document.write( "mean.\r\n" );
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document.write( "f(x) is the same thing as y, and\r\n" );
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document.write( "f( ) means the value of y when whatever is inside the\r\n" );
document.write( "parentheses is substituted for x.\r\n" );
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document.write( " and \r\n" );
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document.write( "In other words, yours is the same problem as this:\r\n" );
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document.write( "Given\r\n" );
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document.write( "Find a value of k such that when you substitute 2k\r\n" );
document.write( "for x, you will get y = 2k.\r\n" );
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document.write( "So you substitute x = 2k and y = 2k\r\n" );
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document.write( "Solve that for k.  You will get two solutions, and one of\r\n" );
document.write( "them is in the list.\r\n" );
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document.write( "Try to learn to interpret functional notation.\r\n" );
document.write( "Study that real hard until you get what it's all about:\r\n" );
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document.write( "f(x) is the same thing as y, and\r\n" );
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document.write( "f( ) means the value of y when whatever is inside the\r\n" );
document.write( "parentheses is substituted for x.\r\n" );
document.write( "Edwin

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