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Olá Jheeni,
boa noite!
![E=(a-b)^2-(a+b)(a-b)\\\\E=(a-b)(a-b)-(a+b)(a-b)\\\\E=(a-b)\left[(a-b)-(a+b)\right]\\\\E=(a-b)(a-b-a-b)\\\\E=(a-b)(-2b)\\\\\boxed{E=-2b(a-b)}](https://tex.z-dn.net/?f=E%3D%28a-b%29%5E2-%28a%2Bb%29%28a-b%29%5C%5C%5C%5CE%3D%28a-b%29%28a-b%29-%28a%2Bb%29%28a-b%29%5C%5C%5C%5CE%3D%28a-b%29%5Cleft%5B%28a-b%29-%28a%2Bb%29%5Cright%5D%5C%5C%5C%5CE%3D%28a-b%29%28a-b-a-b%29%5C%5C%5C%5CE%3D%28a-b%29%28-2b%29%5C%5C%5C%5C%5Cboxed%7BE%3D-2b%28a-b%29%7D "E=(a-b)^2-(a+b)(a-b)\\\\E=(a-b)(a-b)-(a+b)(a-b)\\\\E=(a-b)\left[(a-b)-(a+b)\right]\\\\E=(a-b)(a-b-a-b)\\\\E=(a-b)(-2b)\\\\\boxed{E=-2b(a-b)}")
boa noite!
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