document.write( "Question 171807: 3x^2 -x-2 =0 how do I solve this equation using quadratic solution...thank you very much for helping me... \n" ); document.write( "
Algebra.Com's Answer #126912 by jim_thompson5910(35256)\"\" \"About 
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\n" ); document.write( "\n" ); document.write( "\"3x%5E2-x-2=0\" Start with the given equation.\r
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\n" ); document.write( "\n" ); document.write( "Notice we have a quadratic equation in the form of \"ax%5E2%2Bbx%2Bc\" where \"a=3\", \"b=-1\", and \"c=-2\"\r
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\n" ); document.write( "\n" ); document.write( "Let's use the quadratic formula to solve for x\r
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\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
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\n" ); document.write( "\n" ); document.write( "\"x+=+%28-%28-1%29+%2B-+sqrt%28+%28-1%29%5E2-4%283%29%28-2%29+%29%29%2F%282%283%29%29\" Plug in \"a=3\", \"b=-1\", and \"c=-2\"\r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%281+%2B-+sqrt%28+%28-1%29%5E2-4%283%29%28-2%29+%29%29%2F%282%283%29%29\" Negate \"-1\" to get \"1\". \r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%281+%2B-+sqrt%28+1-4%283%29%28-2%29+%29%29%2F%282%283%29%29\" Square \"-1\" to get \"1\". \r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%281+%2B-+sqrt%28+1--24+%29%29%2F%282%283%29%29\" Multiply \"4%283%29%28-2%29\" to get \"-24\"\r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%281+%2B-+sqrt%28+1%2B24+%29%29%2F%282%283%29%29\" Rewrite \"sqrt%281--24%29\" as \"sqrt%281%2B24%29\"\r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%281+%2B-+sqrt%28+25+%29%29%2F%282%283%29%29\" Add \"1\" to \"24\" to get \"25\"\r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%281+%2B-+sqrt%28+25+%29%29%2F%286%29\" Multiply \"2\" and \"3\" to get \"6\". \r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%281+%2B-+5%29%2F%286%29\" Take the square root of \"25\" to get \"5\". \r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%281+%2B+5%29%2F%286%29\" or \"x+=+%281+-+5%29%2F%286%29\" Break up the expression. \r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%286%29%2F%286%29\" or \"x+=++%28-4%29%2F%286%29\" Combine like terms. \r
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\n" ); document.write( "\n" ); document.write( "\"x+=+1\" or \"x+=+-2%2F3\" Simplify. \r
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\n" ); document.write( "\n" ); document.write( "So the answers are \"x+=+1\" or \"x+=+-2%2F3\" \r
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