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Автор - makssmurfa

Решите уравнение, плиз!!!!!

1) (x-4)(x^{2} + 4х + 16) + 28 = x^{2} (x-25)

2) (2х+1)(4x^{2} - 2х + 1) - 1 = 1.6x^{2} (5х-2)

Ответ

Проверено экспертом

Автор - Universalka

1)(x-4)(x^{2}+4x+16)+28=x^{2}(x-25)\\x^{3}+4x^{2}+16x-4x^{2}-16x-64+28=x^{3}-25x^{2}\\x^{3}-36-x^{3}+25x^{2}=0\\25x^{2}=36\\x^{2}=frac{36}{25}\\x_{1}=-sqrt{frac{36}{25}}=-frac{6}{5}=-1,2\\x_{2}=sqrt{frac{36}{25}}=frac{6}{5}=1,2\\Otvet:boxed{-1,2;1,2}

2)(2x+1)(4x^{2} -2x+1)-1=1,6x^{2}(5x-2)\\8x^{3}-4x^{2}+2x+4x^{2} -2x+1-1=8x^{3}-3,2x^{2}\\8x^{3}=8x^{3}-3,2x^{2}\\3,2x^{2}=0\\x=0\\Otvet:boxed{0}

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