Ответ:
Получится 15х вот такой ответ
( х - 7 )^2 - х( 6 + х ) = х^2 -14х + 49 - 6х - х^2 = 49 - 20х
х = - 1/20
49 - 20•( - 1/10 ) = 49 + 1 = 50
Ответ 50
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=(х^2-16)(x+1)^2=(х^2-16)(x^2+2x+1)=x^4+2x^3+x^2-16x^2-32x-16 =x^4+2x^3-15x^2-32x-16