document.write( "Question 980601: If \"+x=+sqrt%28pq%29+\" and \"+y+=+%281%2F2%29+%28p%2Bq%29\". Prove \"x%3Cy\" \n" ); document.write( "
Algebra.Com's Answer #601733 by Edwin McCravy(20060)\"\" \"About 
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document.write( "The other tutor is right, so for the statement to be true, we must\r\n" );
document.write( "change the conclusion from \"x+%3C+y\" to \"x+%3C=+y\"\r\n" );
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document.write( "But that's not all we have to change.\r\n" );
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document.write( "The statement is also not true if p=-1, q=-9\r\n" );
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document.write( "For in that case  \"+x=+sqrt%28%28-1%29%28-9%29%29=sqrt%289%29=3+\"\r\n" );
document.write( "and \"+y+=+%281%2F2%29+%28%28-1%29%5E%22%22%2B%28-9%29%29=%281%2F2%29%28-10%29=-5\" and x>y\r\n" );
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document.write( "The statement is also not true if p=0, q=-2\r\n" );
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document.write( "For in that case  \"+x=+sqrt%28%280%29%28-2%29%29=sqrt%280%29=0+\"\r\n" );
document.write( "and \"+y+=+%281%2F2%29+%28%280%29%5E%22%22%2B%28-2%29%29=%281%2F2%29%28-2%29=-1\" and x>y\r\n" );
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document.write( "Also by symmetry it is not true if p=-2, q=0\r\n" );
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document.write( "So we must change your statement to something that is always true:\r\n" );
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document.write( "If \"+x=+sqrt%28pq%29+\", \"+y+=+%281%2F2%29+%28p%2Bq%29\", \"p+%3E=+0\", \"q+%3E=+0\", prove \"x%3C=y\"\r\n" );
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document.write( "\"sqrt%28pq%29=sqrt%28p%29sqrt%28q%29\"\r\n" );
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document.write( "So what we are to prove becomes\r\n" );
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document.write( "If \"+x=+sqrt%28p%29sqrt%28q%29+\" and \"+y+=+%281%2F2%29+%28p%2Bq%29\". Prove \"x%3C=y\"\r\n" );
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document.write( "To prove \"x%3C=y\" is the same as proving \"x-y%3C=0\"\r\n" );
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document.write( "Let \"r=sqrt%28p%29\" and \"s=sqrt%28q%29\"\r\n" );
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document.write( "Then \"p=r%5E2\" and \"q=s%5E2\"\r\n" );
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document.write( "Then what we are to prove becomes:\r\n" );
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document.write( "If \"+x=+rs+\" and \"+y+=+%281%2F2%29+%28r%5E2%2Bs%5E2%29\". Prove \"x-y%3C=0\"\r\n" );
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document.write( "So we consider \r\n" );
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document.write( "With the inclusion in the premise than p and q are non-negative and\r\n" );
document.write( "in the conclusion that \"p%3C=q\" we have proved the statement. \r\n" );
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document.write( "Edwin
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