document.write( "Question 815452: if x*x+y*y=7xy, prove
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Algebra.Com's Answer #853720 by MathTherapy(10699) $\"\"$ $\"About$

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document.write( "if x*x+y*y=7xy, prove\r\n" );
document.write( "log(x+y)=1/2(logx+logy)+log3\r\n" );
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document.write( "If x*x+y*y=7xy, prove log(x+y)=1/2(logx+logy)+log3\r\n" );
document.write( "   Prove: \r\n" );
document.write( "    ----- Squaring x + y\r\n" );
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document.write( "    --- Substituting 7xy for  (GIVEN)\r\n" );
document.write( "   \r\n" );
document.write( " ------- Taking the square root of both sides\r\n" );
document.write( "      <=== ONLY the POSITIVE square root on the right-side is needed here \r\n" );
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document.write( " ----- Taking the log of both sides of the above equation\r\n" );
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document.write( " <=== QED!

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