document.write( "Question 1164777: the sum of the roots of a quadratic equation is -4. if one of the roots is 7, how would you determine the equation? write the equation. \n" ); document.write( "
Algebra.Com's Answer #789197 by Edwin McCravy(20056)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "By this formula:\r\n" );
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document.write( "Put -4 for the sum of roots.\r\n" );
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document.write( "One root is given as 7.\r\n" );
document.write( "Let the other root be R:\r\n" );
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document.write( "Then 7 + R = -4\r\n" );
document.write( "         R = -4 - 7\r\n" );
document.write( "         R = -11\r\n" );
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document.write( "Put (7)(-11)=-77 for the product of roots:\r\n" );
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document.write( "Simplify the signs:\r\n" );
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document.write( "Check by factoring:\r\n" );
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document.write( "     x² + 4x - 77 = 0\r\n" );
document.write( "  (x + 11)(x - 7) = 0\r\n" );
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document.write( "x + 11 = 0;   x - 7 = 0\r\n" );
document.write( "     x = -11;     x = 7     \r\n" );
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document.write( "Edwin
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