document.write( "Question 78764: Given f(x) = 4-x-x2, find f(-3) \n" ); document.write( "
Algebra.Com's Answer #56505 by Edwin McCravy(20055)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "Given f(x) = 4 - x - x², find f(-3)\r\n" );
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document.write( "That's just a easy \"plug-in\".\r\n" );
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document.write( "f(x) does NOT mean fx.  It means\r\n" );
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document.write( "\"Plug in for x on my right side\r\n" );
document.write( "whatever is in the parentheses and \r\n" );
document.write( "simplify\"\r\n" );
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document.write( "When you are given an equation for\r\n" );
document.write( "f(x) and then asked to find \r\n" );
document.write( "f(some number) all you do is plug in\r\n" );
document.write( "that number for x all the way across.\r\n" );
document.write( "Then simplify the right side.\r\n" );
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document.write( "Here you are given\r\n" );
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document.write( "     f(x) = 4 - x - x²\r\n" );
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document.write( "and then asked to find f(-3), so all \r\n" );
document.write( "you do is take\r\n" );
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document.write( "     f(x) = 4 - x - x²\r\n" );
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document.write( "and every where you see an x put (-3) \r\n" );
document.write( "in place of it, like this\r\n" );
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document.write( "     f(x) = 4 - x - x²\r\n" );
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document.write( "    f(-3) = 4 - (-3) - (-3)²\r\n" );
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document.write( "Then you simplify the right side\r\n" );
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document.write( "    f(-3) = 4 + 3 + 9\r\n" );
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document.write( "    f(-3) = 16\r\n" );
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document.write( "and you leave it just like that.\r\n" );
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document.write( "Wasn't that easy?  This is probably\r\n" );
document.write( "one of the easiest things you'll\r\n" );
document.write( "ever study in algebra.\r\n" );
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document.write( "Edwin

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