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Solution 2.1:2e

From Förberedande kurs i matematik 1

Revision as of 08:24, 23 September 2008 by Tek (Talk | contribs)
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We expand the two quadratics using the squaring rule, and then sum the result

(a+b)2+(ab)2=(a2+2ab+b2)+(a22ab+b2)=a2+2ab+b2+a22ab+b2=a2+a2+2ab2ab+b2+b2=2a2+2b2.