Solve 2x sqaured minus negative 4x minus 1 is equal to zero, so 2x^2-4x-1=0, by completing the square. Express in simplest radical form, and could someone show me how to check the answer?

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- Nov 18th 2008, 08:56 AMmcinnescompleting the square
Solve 2x sqaured minus negative 4x minus 1 is equal to zero, so 2x^2-4x-1=0, by completing the square. Express in simplest radical form, and could someone show me how to check the answer?

- Nov 18th 2008, 10:39 AMjanvdl

EDIT: For a further explanation: http://www.purplemath.com/modules/sqrquad.htm