-x^2+2x+8=0 решения уровнения. Created by tania78tania500. algebra-ru

-x^2+2x+8=0 решения уровнения...

tania78tania500 @tania78tania500

July 2022 2 16 Report

-x^2+2x+8=0 решения уровнения

miron2077

Verified answer

-х³+2х+8=0
х₁=-2+√(4+32) = -2+6 = -2
-2 -2
х₂=-2-√(4+32) = -2-6 = 4
-2 -2

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tania78tania500 Спасибо:3

Akula17

Verified answer

$-x^2+2x+8=0 / *(-1)$
$x^{2} -2x-8=0$
$D=b^2-4ac=(-2)^2-4*1*(-8)=4+32=36$
$\sqrt{D}= \sqrt{36}=6$
$x_1=-b+ \sqrt{D} / 2a=2+6/2=4$
$x_2=-b- \sqrt{D}/2a=2-6/2=-4/2=-2$
$Otvet:4;-2.$

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