Help with small arithmetic. (Calculus)

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Help with small arithmetic. (Calculus)

Mathematics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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I understand everything in this problem, but how did the sign changed from a minus sign to plus sign?
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Think of it instead as multiplying top and bottom by 1/sqrt(x^2). That should go straight into the radical but for the x terms note that 1/sqrt(x^2) = 1/|x| = -1/x as x<0 Different algebra but same result.

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