document.write( "Question 337410: For each function, find f(-2), f(-1/2), f(3), and f(7) \r
\n" ); document.write( "\n" ); document.write( "f(x) = 5x+2 is the first one... I don't even understand what they are asking me to do... or begin to know how to start... \n" ); document.write( "
Algebra.Com's Answer #241839 by Edwin McCravy(20055)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "First of all, be sure you know that f(x) does not mean \"f times x\"\r\n" );
document.write( "even though in basic algebra that's what it would have meant.  But \r\n" );
document.write( "in more advanced algebra it means something else: \r\n" );
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document.write( "f(  )  says:\r\n" );
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document.write( "\"Find the equation that starts off \"f(x) =\" and substitute \r\n" );
document.write( "whatever is in my parentheses for x in whatever is on the\r\n" );
document.write( "right side of the equal sign in that equation.\"\r\n" );
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document.write( "f(-2)  says:\r\n" );
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document.write( "\"Find the equation that starts off \"f(x) =\" and substitute \r\n" );
document.write( "what is in my parentheses, which is (-2), for x in whatever \r\n" );
document.write( "is on the right side of the equal sign in that equation and\r\n" );
document.write( "simplify.\"\r\n" );
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document.write( "So we find the equation that starts off \"f(x)=\" which is\r\n" );
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document.write( "f(x) = 5x+2\r\n" );
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document.write( "and we substitute (-2) for x in what is on the right\r\n" );
document.write( "side, which is 5x+2\r\n" );
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document.write( "f(-4) = 5(-4)+2\r\n" );
document.write( "f(-4) = -20+2\r\n" );
document.write( "f(-4) = -18\r\n" );
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document.write( "f(\"-1%2F2\")  says:\r\n" );
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document.write( "\"Find the equation that starts off \"f(x) =\" and substitute \r\n" );
document.write( "what is in my parentheses, which is (\"-1%2F2\"), for x in whatever \r\n" );
document.write( "is on the right side of the equal sign in that equation and\r\n" );
document.write( "simplify.\"\r\n" );
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document.write( "So we find the equation that starts off \"f(x)=\" which is\r\n" );
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document.write( "f(x) = 5x+2\r\n" );
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document.write( "and we substitute (\"-1%2F2\") for x in what is on the right\r\n" );
document.write( "side, which is 5x+2\r\n" );
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document.write( "f(\"-1%2F2\") = 5(\"-1%2F2\")+2\r\n" );
document.write( "f(-4) = \"-5%2F2\"+2\r\n" );
document.write( "f(-4) = \"-5%2F2%2B4%2F2\"\r\n" );
document.write( "f(-4) = \"-1%2F2\"\r\n" );
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document.write( "You do the other two the same way.\r\n" );
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document.write( "Answers: \r\n" );
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document.write( "f(3) = 17\r\n" );
document.write( "f(7) = 37\r\n" );
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document.write( "Edwin

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