document.write( "Question 74039:
FIND THE DOMAIN FOR \"f%28x%29+=+sqrt%283x%2B21%29\",
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Algebra.Com's Answer #53120 by Edwin McCravy(20054)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "FIND THE DOMAIN FOR \"f%28x%29+=+sqrt%283x%2B21%29\",\r\n" );
document.write( "AND EXPRESS IT USING INTERVAL NOTATION.\r\n" );
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document.write( "        \"f%28x%29+=+sqrt%283x%2B21%29\"\r\n" );
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document.write( "The \"3x%2B21\" is under a square root radical, and\r\n" );
document.write( "we must never have a negative number under a\r\n" );
document.write( "square root (or any EVEN root) radical. So\r\n" );
document.write( "we must set \"3x%2B21%3E=0\"\r\n" );
document.write( "              \"3x%3E=-21\" \r\n" );
document.write( "               \"x%3E=-7\"\r\n" );
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document.write( "Interval notation for that is [-7,¥)\r\n" );
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document.write( "Edwin
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