document.write( "Question 388163: x=5y^2+40y+77
\n" ); document.write( "Find the vertex. So far I used (b/2)^2=(40/2)^2=20^2=400
\n" ); document.write( "Then x=(5y^2+40y+400)-400+77
\n" ); document.write( "Then x=5(y^2+8y+80)-323 I don't know what to do afterwards. \n" ); document.write( "

Algebra.Com's Answer #274514 by Fombitz(32388) $\"\"$ $\"About$

You can put this solution on YOUR website!
Factor out the 5 first.
\n" ); document.write( " $\"x=5y%5E2%2B40y%2B77\"$
\n" ); document.write( " $\"x=5%28y%5E2%2B8y%29%2B77\"$
\n" ); document.write( " $\"x=5%28y%5E2%2B8y%2B16%29%2B77-5%2816%29\"$
\n" ); document.write( " $\"x=5%28y%2B4%29%5E2%2B77-90\"$
\n" ); document.write( " $\"highlight%28x=5%28y%2B4%29%5E2-3%29\"$ \r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

\n" );