document.write( "Question 1033851: what is the solution (or simplified version, i believe) of log base 10 x+log base 10(x+21)=2 \n" ); document.write( "

Algebra.Com's Answer #648478 by Alan3354(69443) $\"\"$ $\"About$

You can put this solution on YOUR website!
log(x) + log(x+21) = 2
\n" ); document.write( "log(x*(x+21)) = 2 = log(100)
\n" ); document.write( "x^2 + 21x - 100 = 0
\n" ); document.write( "(x+25)*(x-4) = 0
\n" ); document.write( "x = -25 *** not allowed --> log of negative number
\n" ); document.write( "x = 4
\n" ); document.write( " \n" ); document.write( "

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