If using the method of completing the square to solve the quadratic equation x2-6x-260x and 82032 and 8203 and 8203 and minus6x and minus260 which number would have to be added to complete the square?

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If using the method of completing the square to solve the quadratic equation x2-6x-260x and 82032 and 8203 and 8203 and minus6x and minus260 which number would have to be added to complete the square?