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Автор - apietrov

Является ли число √‎7 корнем уравнения? : (3-x)^{-1}- frac{(x+1)^{2} }{4}=-0,5

Ответ

Проверено экспертом

Автор - igundane

(3-x)^{-1}-frac{(x+1)^2}{4} =-frac{1}{2} <=>frac{1}{3-x} -frac{x^2+2x+1}{4} +frac{1}{2}=0<=>\xneq 3\<=>4-(3-x)(x^2+2x+1)+2(3-x)=0<=>\<=>4-x^2-5x-3+x^3+6-2x=0<=>\<=>x^3-x^2-7x+7=0<=>x(x^2-7)-(x^2-7)=0<=>\<=>(x^2-7)(x-1)=0\x=-sqrt{7}\x=sqrt{7}\x=1

x=√7 - является корнем уравнения

Ответ

Автор - takushnir

Ответ во вложении Объяснение:

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