Efectuar (a+b) al cuadrado - (a+b)(a-b) - [a (2b - 2) - ( -b al cuadrado - 2a) ]
carlossauhing
(![(a+b)^{2} -(a+b)(a-b)-[a(2b-2)-(- b^{2} -2a)] \\ =a^{2} +2ab+b^{2}-( a^{2} -b^{2} )-[2ab-2a+b^{2}+2a] \\= a^{2}+2ab+b^{2}-a^{2}+b^{2}-2ab+2a-b^{2}-2a \\ =2b^{2}](https://tex.z-dn.net/?f=+%28a%2Bb%29%5E%7B2%7D+-%28a%2Bb%29%28a-b%29-%5Ba%282b-2%29-%28-+b%5E%7B2%7D+-2a%29%5D%0A+%5C%5C++%3Da%5E%7B2%7D+%2B2ab%2Bb%5E%7B2%7D-%28+a%5E%7B2%7D++-b%5E%7B2%7D+%29-%5B2ab-2a%2Bb%5E%7B2%7D%2B2a%5D%0A+%5C%5C%3D+a%5E%7B2%7D%2B2ab%2Bb%5E%7B2%7D-a%5E%7B2%7D%2Bb%5E%7B2%7D-2ab%2B2a-b%5E%7B2%7D-2a%0A+%5C%5C+%3D2b%5E%7B2%7D "(a+b)^{2} -(a+b)(a-b)-[a(2b-2)-(- b^{2} -2a)] \\ =a^{2} +2ab+b^{2}-( a^{2} -b^{2} )-[2ab-2a+b^{2}+2a] \\= a^{2}+2ab+b^{2}-a^{2}+b^{2}-2ab+2a-b^{2}-2a \\ =2b^{2}")
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dianadu122017
Grqcias!!
carlossauhing
De nada... !saludos¡
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