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Lösung 2.1:2e

Aus Online Mathematik Brückenkurs 1

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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.
Von „http://wiki.sommarmatte.se/wikis/2009/bridgecourse1-TU-Berlin/index.php/L%C3%B6sung_2.1:2e“