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Solution 2.1:3d

From Förberedande kurs i matematik 1

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Revision as of 08:35, 9 September 2008

By writing the expression as x2−25x+55, applying the squaring rule x2−2ax+a2=(x−a)2 then gives

x2−10x+55=x2−25x+55=(x−5)2

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