Помогите пжДам 30 балов! Тут нужно спростить(-x-5)^2+(x-4)(-x-4)+(x-3)(x+7). Created by Schoolgirl1313. algebra-ru

Помогите пжДам 30 балов! Тут нужно спростить(-x-5)^2+(x-4)(-x-4)+(x-3)(x+7)...

Ответ:

$(-x-5)^2+(x-4)(-x-4)+(x-3)(x+7)=\\\\=\Big(-(x+5)\Big)^2-(x-4)(x+4)+(x^2+7x-3x-21)=\\\\=(x+5)^2-(x^2-16)+(x^2+4x-21)=\\\\=(x^2+10x+25)+4x-5=\\\\=x^2+14x+20$

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Ответ:

(х+5)^2-(x-4)(x+4)+(x-3)(x+7)=x^2+10x+25-(x^2-16)+x^2+7x-3x-21= x^2+10x+25-x^2+16+x^2+4x-21=x^2+14x+20

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