document.write( "Question 404411: solve
\n" ); document.write( " \n" ); document.write( "
Algebra.Com's Answer #285783 by MathLover1(20850)\"\" \"About 
You can put this solution on YOUR website!
\"sqrt%285x%2B21%29+=+x+%2B+3\".......to the second power\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"%28sqrt%285x%2B21%29%29%5E2+=+%28x+%2B+3%29%5E2\"\r
\n" ); document.write( "\n" ); document.write( "\"5x%2B21+=+x%5E2+%2B+6x+%2B+9\"\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"0+=+x%5E2+%2B+6x+-+5x+-21%2B+9\"...or\r
\n" ); document.write( "\n" ); document.write( "\"x%5E2+%2B+6x+-+5x+-21%2B+9+=+0\"\r
\n" ); document.write( "\n" ); document.write( "\"x%5E2+%2B+x++-12+=+0\".....use quadratic formula and plug in \"a=1\",\"+%0D%0A%0D%0Ab=1\", and \"c=-12\"\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+\"\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"x+=+%28-1+%2B-+sqrt%28+1%5E2-4%2A1%2A%28-12%29+%29%29%2F%282%2A1%29+\"\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"x+=+%28-1+%2B-+sqrt%28+1+%2B+48+%29%29%2F2+\"\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"x+=+%28-1+%2B-+sqrt%28+49+%29%29%2F2+\"\r
\n" ); document.write( "\n" ); document.write( "\"x+=+%28-1+%2B-++7+%29%2F2+\"\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"x1+=+%28-1+%2B+7+%29%2F2+\"\r
\n" ); document.write( "\n" ); document.write( "\"x1+=+6+%2F2+\"\r
\n" ); document.write( "\n" ); document.write( "\"x1+=+3+\"\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"x2+=+%28-1+-7+%29%2F2+\"\r
\n" ); document.write( "\n" ); document.write( "\"x2+=+%28-8+%29%2F2+\"\r
\n" ); document.write( "\n" ); document.write( "\"x2+=+-4+\"\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "check:\r
\n" ); document.write( "\n" ); document.write( "\"sqrt%285x%2B21%29+=+x+%2B+3\"........plug in \"x1+=+3+\"\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"sqrt%285%2A3%2B21%29+=+3+%2B+3\"\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"sqrt%2815%2B21%29+=+6\"\r
\n" ); document.write( "\n" ); document.write( "\"sqrt%2836%29+=+6\"\r
\n" ); document.write( "\n" ); document.write( "\"6+=+6\"\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "
\n" );