document.write( "Question 1063605: 3x^2 +3x =21. Solve this problem by using the quadratic formula. Show all work.\r
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Algebra.Com's Answer #678721 by ikleyn(52802)\"\" \"About 
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\n" ); document.write( "3x^2 +3x =21. Solve this problem by using the quadratic formula. Show all work.\r
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document.write( "\"3x%5E2+%2B3x\" = 21     Divide both sides by 3\r\n" );
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document.write( "\"x%5E2+%2B+x\" = 7  --->\r\n" );
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document.write( "\"x%5E2+%2B+x+-+7\" = 0.\r\n" );
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document.write( "Apply the quadratic formula\r\n" );
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document.write( "    (for the general quadratic equation \"ax%5E2+%2B+bx+%2B+c\" = 0 it is \"x%5B1%2C2%5D\" = \"%28-b+%2B-+sqrt%28b%5E2+-+4ac%29%29%2F%282a%29\" ).\r\n" );
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document.write( "So, in your case you have \r\n" );
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document.write( "    \"x%5B1%2C2%5D\" = \"%28-1+%2B-+sqrt%28%28-1%29%5E2+-+4%2A1%2A%28-7%29%29%29%2F%282%2A1%29\" = \"%28-1+%2B-+sqrt%2829%29%29%2F2\".\r\n" );
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document.write( "Answer.  \"x%5B1%5D\" = \"%28-1+%2B+sqrt%2829%29%29%2F2\",   \"x%5B2%5D\" = \"%28-1+%2B+sqrt%2829%29%29%2F2\".\r\n" );
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\n" ); document.write( "\n" ); document.write( "Now listen to me very attentively.\r
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\n" ); document.write( "\n" ); document.write( "The quadratic formula is described everywhere, in every and each algebra textbook.\r
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\n" ); document.write( "\n" ); document.write( "You can read about it in the lessons \r
\n" ); document.write( "\n" ); document.write( "    - Introduction into Quadratic Equations\r
\n" ); document.write( "\n" ); document.write( "    - PROOF of quadratic formula by completing the square\r
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\n" ); document.write( "\n" ); document.write( "So, applying this formula and making these calculations is absolutely mechanical work.\r
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\n" ); document.write( "\n" ); document.write( "We, tutors, usually do not do such work for students, assuming that it is students' work, not the tutors' work.\r
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\n" ); document.write( "\n" ); document.write( "As you ask us to do it, I presume you are for the first time applying the quadratic formula.
\n" ); document.write( "It is the only reason why I did it for you.\r
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\n" ); document.write( "\n" ); document.write( "For the future, memorize: IT IS YOUR JOB.\r
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