document.write( "Question 499743: 9x^2+11x+18=-10x+8 \n" ); document.write( "
Algebra.Com's Answer #337858 by jim_thompson5910(35256)\"\" \"About 
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\n" ); document.write( "\n" ); document.write( "\"9x%5E2%2B11x%2B18=-10x%2B8\" Start with the given equation.\r
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\n" ); document.write( "\n" ); document.write( "\"9x%5E2%2B11x%2B18%2B10x-8=0\" Get every term to the left side.\r
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\n" ); document.write( "\n" ); document.write( "\"9x%5E2%2B21x%2B10=0\" Combine like terms.\r
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\n" ); document.write( "\n" ); document.write( "Notice that the quadratic \"9x%5E2%2B21x%2B10\" is in the form of \"Ax%5E2%2BBx%2BC\" where \"A=9\", \"B=21\", and \"C=10\"\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-%2821%29+%2B-+sqrt%28+%2821%29%5E2-4%289%29%2810%29+%29%29%2F%282%289%29%29\" Plug in \"A=9\", \"B=21\", and \"C=10\"\r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%28-21+%2B-+sqrt%28+441-4%289%29%2810%29+%29%29%2F%282%289%29%29\" Square \"21\" to get \"441\". \r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%28-21+%2B-+sqrt%28+441-360+%29%29%2F%282%289%29%29\" Multiply \"4%289%29%2810%29\" to get \"360\"\r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%28-21+%2B-+sqrt%28+81+%29%29%2F%282%289%29%29\" Subtract \"360\" from \"441\" to get \"81\"\r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%28-21+%2B-+sqrt%28+81+%29%29%2F%2818%29\" Multiply \"2\" and \"9\" to get \"18\". \r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%28-21+%2B-+9%29%2F%2818%29\" Take the square root of \"81\" to get \"9\". \r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%28-21+%2B+9%29%2F%2818%29\" or \"x+=+%28-21+-+9%29%2F%2818%29\" Break up the expression. \r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%28-12%29%2F%2818%29\" or \"x+=++%28-30%29%2F%2818%29\" Combine like terms. \r
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\n" ); document.write( "\n" ); document.write( "\"x+=+-2%2F3\" or \"x+=+-5%2F3\" Simplify. \r
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\n" ); document.write( "\n" ); document.write( "So the solutions are \"x+=+-2%2F3\" or \"x+=+-5%2F3\" \r
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