document.write( "Question 156350: Solve 6x^2+3x-18=0 using the quadratic formula \n" ); document.write( "
Algebra.Com's Answer #115151 by jim_thompson5910(35256)\"\" \"About 
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\n" ); document.write( "\"6x%5E2%2B3x-18=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=6\", \"b=3\", and \"c=-18\"\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-%283%29+%2B-+sqrt%28+%283%29%5E2-4%286%29%28-18%29+%29%29%2F%282%286%29%29\" Plug in \"a=6\", \"b=3\", and \"c=-18\"\r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%28-3+%2B-+sqrt%28+9-4%286%29%28-18%29+%29%29%2F%282%286%29%29\" Square \"3\" to get \"9\". \r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%28-3+%2B-+sqrt%28+9--432+%29%29%2F%282%286%29%29\" Multiply \"4%286%29%28-18%29\" to get \"-432\"\r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%28-3+%2B-+sqrt%28+9%2B432+%29%29%2F%282%286%29%29\" Rewrite \"sqrt%289--432%29\" as \"sqrt%289%2B432%29\"\r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%28-3+%2B-+sqrt%28+441+%29%29%2F%282%286%29%29\" Add \"9\" to \"432\" to get \"441\"\r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%28-3+%2B-+sqrt%28+441+%29%29%2F%2812%29\" Multiply \"2\" and \"6\" to get \"12\". \r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%28-3+%2B-+21%29%2F%2812%29\" Take the square root of \"441\" to get \"21\". \r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%28-3+%2B+21%29%2F%2812%29\" or \"x+=+%28-3+-+21%29%2F%2812%29\" Break up the expression. \r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%2818%29%2F%2812%29\" or \"x+=++%28-24%29%2F%2812%29\" Combine like terms. \r
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\n" ); document.write( "\n" ); document.write( "\"x+=+3%2F2\" or \"x+=+-2\" Simplify. \r
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\n" ); document.write( "\n" ); document.write( "So the answers are \"x+=+3%2F2\" or \"x+=+-2\" \r
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