Answers: 3
or 
<-- there's no plus/minus sign.
<-- root.
<-- root. ![[(3-\sqrt{7})-(3+\sqrt{7})]^{2}](/tpl/images/1059/9276/8dbe7.png)
<-- don't forget to distribute the negative.
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Let r and s be the roots of x^2 - 6x + 2 = 0. Find (r - s)^2....
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