document.write( "Question 246588: $\"log2%28y%2B4%29%2Blog2y=5\"$ \n" ); document.write( "

Algebra.Com's Answer #180015 by stanbon(75887) $\"\"$ $\"About$

You can put this solution on YOUR website!
log2(y+4)+log2y=5
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\n" ); document.write( "log2[y(y+4)] = 5
\n" ); document.write( "---
\n" ); document.write( "log2[y^2+4y] = 5
\n" ); document.write( "y^2+4y-25 = 0
\n" ); document.write( "---
\n" ); document.write( "y = [-4 +- sqrt(16 - 4*-25)]/2
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\n" ); document.write( "y = [-4 +- sqrt(116)]/2
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\n" ); document.write( "y = [-4 +- 2sqrt(29)]/2
\n" ); document.write( "---
\n" ); document.write( "y = [-2 +- sqrt(29)]
\n" ); document.write( "===========================
\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H \n" ); document.write( "

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