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Solution 2.1:2e

From Förberedande kurs i matematik 1

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Revision as of 06:34, 21 August 2008

We expand the two quadratics using the squaring rule, and then sum the result.

(a+b)2+(a−b)2=(a2+2ab+b2)+(a2−2ab+b2)=a2+2ab+b2+a2−2ab+b2=a2+a2+2ab−2ab+b2+b2=2a2+2b2

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