document.write( "Question 528521: log x + log y (x-21)=2 \n" ); document.write( "

Algebra.Com's Answer #349589 by lwsshak3(11628) $\"\"$ $\"About$

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solve for x
\n" ); document.write( "log x + log y (x-21)=2
\n" ); document.write( "log[x(x-21)]=2
\n" ); document.write( "convert to exponential form: base(10) raised to log of number(2)=number(x(x-21))
\n" ); document.write( "10^2=x^2-21x
\n" ); document.write( "x^2-21x-100=0
\n" ); document.write( "(x-25)(x+4)=0
\n" ); document.write( "x=25
\n" ); document.write( "or
\n" ); document.write( "x=-4 \n" ); document.write( "

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