document.write( "Question 336173: x^2=20+8x\r
\n" ); document.write( "\n" ); document.write( "6x^2=5x+6\r
\n" ); document.write( "\n" ); document.write( "x^2+7=18
\n" ); document.write( "
\n" ); document.write( "

Algebra.Com's Answer #241056 by jim_thompson5910(35256)\"\" \"About 
You can put this solution on YOUR website!
I'll do the first one. Please only post one problem at a time.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"x%5E2=20%2B8x\" Start with the given equation.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"x%5E2-20-8x=0\" Get every term to the left side.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"x%5E2-8x-20=0\" Rearrange the terms.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Notice that the quadratic \"x%5E2-8x-20\" is in the form of \"Ax%5E2%2BBx%2BC\" where \"A=1\", \"B=-8\", and \"C=-20\"\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Let's use the quadratic formula to solve for \"x\":\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"x+=+%28-B+%2B-+sqrt%28+B%5E2-4AC+%29%29%2F%282A%29\" Start with the quadratic formula\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"x+=+%28-%28-8%29+%2B-+sqrt%28+%28-8%29%5E2-4%281%29%28-20%29+%29%29%2F%282%281%29%29\" Plug in \"A=1\", \"B=-8\", and \"C=-20\"\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"x+=+%288+%2B-+sqrt%28+%28-8%29%5E2-4%281%29%28-20%29+%29%29%2F%282%281%29%29\" Negate \"-8\" to get \"8\". \r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"x+=+%288+%2B-+sqrt%28+64-4%281%29%28-20%29+%29%29%2F%282%281%29%29\" Square \"-8\" to get \"64\". \r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"x+=+%288+%2B-+sqrt%28+64--80+%29%29%2F%282%281%29%29\" Multiply \"4%281%29%28-20%29\" to get \"-80\"\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"x+=+%288+%2B-+sqrt%28+64%2B80+%29%29%2F%282%281%29%29\" Rewrite \"sqrt%2864--80%29\" as \"sqrt%2864%2B80%29\"\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"x+=+%288+%2B-+sqrt%28+144+%29%29%2F%282%281%29%29\" Add \"64\" to \"80\" to get \"144\"\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"x+=+%288+%2B-+sqrt%28+144+%29%29%2F%282%29\" Multiply \"2\" and \"1\" to get \"2\". \r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"x+=+%288+%2B-+12%29%2F%282%29\" Take the square root of \"144\" to get \"12\". \r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"x+=+%288+%2B+12%29%2F%282%29\" or \"x+=+%288+-+12%29%2F%282%29\" Break up the expression. \r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"x+=+%2820%29%2F%282%29\" or \"x+=++%28-4%29%2F%282%29\" Combine like terms. \r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"x+=+10\" or \"x+=+-2\" Simplify. \r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "So the solutions are \"x+=+10\" or \"x+=+-2\" \r
\n" ); document.write( "\n" ); document.write( " \r
\n" ); document.write( "\n" ); document.write( "If you need more help, email me at jim_thompson5910@hotmail.com\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Also, feel free to check out my website. \r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Jim
\n" ); document.write( "
\n" );