document.write( "Question 965743: Solve and then check, show all work
\n" ); document.write( "15x+12=-3x^2 \n" ); document.write( "

Algebra.Com's Answer #590264 by lwsshak3(11628) $\"\"$ $\"About$

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Solve and then check, show all work
\n" ); document.write( "15x+12=-3x^2
\n" ); document.write( "3x^2+15x+12=0
\n" ); document.write( "x^2+5x+4=0
\n" ); document.write( "(x+4)(x+1)=0
\n" ); document.write( "x=-4
\n" ); document.write( "or
\n" ); document.write( "x=-1
\n" ); document.write( "check:
\n" ); document.write( "f(-4)
\n" ); document.write( "15*-4+12=-3*(-4)^2
\n" ); document.write( "-60+12=-48
\n" ); document.write( "-48=-48
\n" ); document.write( "..
\n" ); document.write( "f(-1)
\n" ); document.write( "15*-1+12=-3*(-1)^2
\n" ); document.write( "-3=-3
\n" ); document.write( "check ok
\n" ); document.write( " \n" ); document.write( "

\n" );