document.write( "Question 688053: log4(x+1)+ log4 (x-5)=2 \n" ); document.write( "

Algebra.Com's Answer #425499 by lwsshak3(11628) $\"\"$ $\"About$

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log4(x+1)+ log4 (x-5)=2
\n" ); document.write( "log4[(x+1)(x-5)]=log4(16)
\n" ); document.write( "(x+1)(x-5)=16
\n" ); document.write( "x^2-4x-5=16
\n" ); document.write( "x^2-4x-21=0
\n" ); document.write( "(x-7(x+3)=0
\n" ); document.write( "x=-3 (reject, (x+1)>0)
\n" ); document.write( "x=7 \n" ); document.write( "

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