document.write( "Question 1209937: Let f be a function such that
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Algebra.Com's Answer #851143 by mccravyedwin(407)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "Ikleyn is right that the equation is not valid for all real y, as is stated.\r\n" );
document.write( "It is only valid for all real x and  \"y=+%22%22+%2B-+1\".  \r\n" );
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document.write( "Note that f(1) = 0\r\n" );
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document.write( "\"f%281%2A1%29+%2B+1+=+1%2Af%281%29+%2B+f%281%29+%2B+1\"\r\n" );
document.write( "\"f%281%29+=+2%2Af%281%29\"\r\n" );
document.write( "\"0=f%281%29\"\r\n" );
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document.write( "Edwin
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