Question

B) c²-a² - b2 + 2abсрочнооооо дам 50 балов
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Answer 1

$\displaystyle\bf\\c^{2} -a^{2} -b^{2} +2ab=c^{2} -\Big(a^{2}-2ab+b^{2} \Big) =c^{2} -\Big(a-b\Big)^{2} =\\\\\\=\Big(c-a+b\Big)\Big(c+a-b\Big)$